At present, it is popular in novel coronavirus. At the same time, we also hear the news that there is no specific drug at present. Some people may ask: Why can’t we treat it with antibiotics?

Because the pathogen this time is a virus, not a bacterium!

What are the similarities and differences between viruses and bacteria? Why can’t we kill the virus with antibiotics?

Image source: veer gallery

Are tiny creatures on the earth.

Bacteria and viruses are microorganisms. As the smallest life form on the earth, people always ignore their existence, but this tiny creature is always painted with a sense of existence, and people will be infected by them if they are not careful.

Bacteria are cells, which have cell walls, DNA and organelles. They can produce and metabolize needed enzymes by themselves, and can divide and reproduce by themselves. Viruses are much smaller than bacteria, and the main structure is protein capsid and internal genetic material (DNA or RNA), and viruses cannot replicate themselves. Viruses need to replicate their genetic material by infecting host cells, and then release more offspring viruses to infect other host cells.

Bacteria can be harmless or even beneficial to human health, and can live independently. The purpose of the virus is to replicate itself, so it has no meaning unless it infects the host. It can be described as the purest "selfish gene".

The size difference between them is about 1000 times.

Bacteria in a broad sense are prokaryotes. Although they have a cell structure, they are still very different from human cells. Their structures are simpler, and they have no nucleus, but only a DNA aggregation area-pseudonucleus. Bacteria are generally spherical, rod-shaped, spiral, etc., and people do not forget to add a description of their shapes when naming them, such as Escherichia coli, Lactobacillus, Staphylococcus aureus and so on (ps. Yeast is a fungus, so there is no shape in the name.

At present, the smallest known bacteria are only 0.2 microns long, so they can only be seen under a microscope; The largest bacteria in the world can be directly seen by naked eyes, and it is 0.2-0.6 mm in size. It is a kind of bacteria called Sulphidophilus Namibia.

Bacterial size

Virus is a noncellular form composed of a nucleic acid molecule (DNA or RNA) and protein. It lives by parasitism and is an organic species between living things and nonliving things. After it enters the cell, its metabolism such as DNA replication is indeed the characteristic of living things, while after it leaves the cell, it is just a lifeless crystal.

Novel coronavirus electron micrograph 　

Most viruses are between 10 and 300 nanometers (nm) in diameter. Some filamentous viruses can be as long as 1400nm, but their width is only about 80nm. Most viruses cannot be observed under optical microscope, and scanning or transmission electron microscope is the main tool to observe the morphology of virus particles. Compared with bacteria, viruses differ in size by about 1000 times.

There are also different ways to invade the human body.

There are many "good people" in bacteria, among which saprophytic bacteria are important decomposers in the ecosystem, which makes the carbon cycle go smoothly; Some bacteria will carry out nitrogen fixation, so that nitrogen can be converted into forms that can be used by biology. The production of cheese, yogurt and fermented grains, the manufacture of some antibiotics and the treatment of wastewater are all related to bacteria. In the field of biotechnology, bacteria are also widely used. Of course, the "bad guys" in bacteria are many pathogenic bacteria, including tuberculosis, anthrax, plague and other diseases are caused by bacteria.

The relationship between bacteria and human body is mainly parasitic. Let’s mainly talk about pathogenic bacteria. Because most bacteria have their own metabolic system, bacteria can be parasitic between normal cells of human body after invading human body. Bacteria take away the nutrients necessary for the body; The growth of bacteria produces various metabolites, which disrupts the physiological balance of the body; Even the size of bacteria has become a pathogenic factor, which interferes with and destroys the function of cells. Therefore, in some diseases, the proliferation of bacteria alone has fatal consequences.

Parasitic diagram of staphylococcus aureus

The virus may have invaded the human body from a sneeze or a physical contact. Viruses need to parasitize in living host cells, and rely on host cells to provide the raw material system, energy and place needed for virus replication. When a virus is ready to infect a host cell, it needs the following six steps to complete its proliferation activities, namely adsorption, invasion, hulling, biosynthesis, assembly and release.

Adsorption: The virus "targets" the target cell by recognizing the specific receptor protein molecules on the surface of the host cell membrane (for example, novel coronavirus virus recognizes angiotensin converting enzyme 2 -ACE2)； on the surface of human respiratory tract and lung cells); Invasion: then the virus either enters the host cell in some way (such as membrane fusion) or directly injects genetic material into the host cell; Shelling: Immediately after the viral infectious nucleic acid is released from the capsid; Biosynthesis: "non-stop" biosynthesis-synthesizing virus nucleic acid and protein according to gene instructions and with the help of raw materials, energy and places provided by host cells; Assembly: The newly synthesized virus nucleic acid and protein will be assembled into progeny virus; Release: the progeny virus is released outside the host cell.

Schematic diagram of virus replication

Human body’s defense and counterattack

Both bacteria and viruses have to break through the human body’s defenses to complete the invasion, but the human body will eventually find their existence, and the human immune system has its own protective measures and early warning mechanism.

The first line of defense: skin and mucous membrane. The first way for human beings to protect themselves is defense, which makes the human body form a relatively closed system through the skin and mucosa. When harmful substances are about to invade the human body, the skin and mucosa will block the external pathogenic factors out of the body.

The second line of defense: bactericidal substances and phagocytes. There are always bactericidal substances and phagocytes patrolling the mucosal surface and inside the human body to prevent the invasion of pathogens. Take lysozyme as an example, it can destroy the cell wall of bacteria, cause the contents of the cell wall to escape and dissolve the bacteria, and can also directly combine with negatively charged virus proteins to form double salts with DNA, RNA and apoprotein, thus inactivating the virus. Therefore, the enzyme has antibacterial, anti-inflammatory and antiviral effects.

The third line of defense: specific immunity. When the powerful pathogen broke through the first two lines of defense, the human body’s counterattack just began. Through the phagocytosis of phagocytes and the analysis of special immune cells (T cells), the human body has produced antibodies that can specifically recognize invaders. The antibodies can make pathogens stick together and no longer be invasive, and finally the pathogens exposed between cells will be killed. But is the virus that invaded the cell safe? No! The human body can subtly identify which cells are infected by the virus, and then send a "killer" to kill the infected cells and release the virus inside the cells for antigen elimination.

However, it takes time for the human body to fight back, and pathogens will invade and occupy the human body through such a time gap!

Auxiliary appearance: drug therapy

Bacterial infection once became the greatest enemy of mankind. For example, the plague was called the "Black Death" in Europe, which reduced the population of Europe by one third in three years. At present, plague and cholera are classified as Class A infectious diseases in China. It was not until the discovery and popularization of antibiotics that human beings controlled the outbreak of bacterial infection.

Antibiotics mainly kill bacteria by destroying the structure of bacterial cells, such as cell wall, cell membrane, changing internal metabolism, hindering the synthesis of nucleic acid and protein, etc.

Chemical structural formula of penicillin

However, antibiotics are ineffective against viruses! Because bacteria and viruses have completely different structures!

Because bacteria have cell walls, as well as their own nucleic acid replication machines and ribosomes, antibiotics can kill bacteria with little side effects on humans as long as they are designed for these targets. However, the virus has no cell wall, its own nuclease and ribosome, and all its functions depend on the host cell. So antibiotics can’t kill viruses (we can’t make an "antibiotic" that kills host cells).

The ideal antiviral drugs can not only act on one or several links of the virus proliferation cycle, but also interfere or block it without affecting the normal metabolism of host cells. For example, ribavirin, a common drug, provides a large number of nucleotide analogues, which replace normal nucleotides, making the virus lose its replication ability and play a role in inhibiting virus amplification (but it also has great side effects on human body). In addition, the anti-influenza drug oseltamivir works by blocking the release of the offspring virus.

In view of this pneumonia epidemic, researchers from Wuhan Institute of Virology, China Academy of Sciences and Academy of Military Medical Sciences have also preliminarily screened out ramidivvir (GS-5734, phase II clinical anti-Ebola drug) and Chloroquine (Sigma-C6628, antimalarial drug) which have good inhibitory effects on novel coronavirus (2019-nCoV) at the cellular level.

But we have to say that in the face of virus treatment, human beings have never found a universal specific drug like antibiotics. Active treatment is to mobilize the human body’s own immune ability to fight against viruses, because only organisms themselves really know how to fight against organisms.

On February 11th, BYD announced at the Eye of the Gods Intelligent Driving Conference that in the next 2-3 years, intelligent driving will become the standard, and all BYD models will be equipped with the "Eye of the Gods" advanced intelligent driving system, and the first batch of 21 models will be listed soon. Among them, more than 100,000 models are standard in the whole system, and most models below 100,000 are equipped. "Eye of the God" is divided into three versions, which are equipped with different brands of BYD models, and it is planned that more than ten models of it will be equipped with Hesse lidar in 2025.

The intelligent driving industry chain has developed rapidly and the hardware configuration has been significantly improved. BYD’s "Eye of God" has more than 10 cameras, and more millimeter-wave radars are used. Industrial chain enterprises such as Heertai, Yutaiwei and Kabeiyi are all involved in the supply, involving intelligent controllers, data transmission, data cables and other products. In terms of cost control, it is estimated that the price of BYD’s intelligent driving system needs to be controlled within 10,000 yuan to maintain market competitiveness, and the addition of DeepSeek technology is expected to help reduce the cost of intelligent driving solutions and promote the comprehensive popularization of intelligent driving.

With the promotion of intellectual driving and equal rights, industry competition intensifies, and price wars may heat up. Car companies need to find a balance between technology research and development and cost control, while facing challenges such as regulations, safety and ethics. CITIC Jiantou Research Report believes that 2025 will be the key node for smart driving to achieve leap-forward development. BYD’s participation is expected to accelerate the penetration rate of smart driving, and the smart driving industry chain is about to enter a golden period of development.

IT House reported on April 26th that Wuling Automobile launched the Wuling E5 pure electric car today, which can be regarded as the online car version of Wuling Starlight, with the price starting from 159,800 yuan.

The car is available in 410 km and 510 km versions, and the official guide price is 159,800 yuan and 169,800 yuan respectively.

For reference, Wuling Starlight Co-creation Edition pure electric vehicles are available in 410 standard and 510 advanced configurations, and the prices are 99,800 yuan and 109,800 yuan respectively.

IT House found that the configurations of the two models are basically the same, equipped with a single motor drive system with a maximum power of 100 kW, and equipped with lithium iron phosphate batteries with two capacities of 41.9 kWh and 54.3 kWh. The length, width and height of the whole vehicle are 4,835 * 1,860 * 1,515 mm respectively, with a wheelbase of 2,800 mm.

The standard configuration of the car includes automatic LED headlights, embedded door handles, 17-inch rims, rain-sensing automatic wipers and electrically heated exterior rearview mirrors, etc. At the same time, it supports Bluetooth key function, and high-profile models also provide 18-inch rims.

The car is also equipped with two floating screens, an 8.8-inch digital LED screen and a 15.6-inch central touch screen. There are two USB ports in the front and rear rows, and the maximum charging power is 20 watts. In addition, the vehicle is also equipped with practical functions such as 6-way electric adjustment of the main driver’s seat, six air outlets in the rear row and ISOFIX child safety seat interface.

Recently, Song Joong Ki announced that his wife was pregnant with a second child, which triggered a heated discussion among netizens. Song Hye Kyo is still single, and their marital status is in sharp contrast. Mr. and Mrs. Song Joong Ki are now in South Korea, and they have begun to prepare for prenatal education and other issues. This news made it on the hot search list of Korean media, which surprised many people at their speed. Song Joong Ki had a son before, and now she is pregnant with a second child. Many people speculate that they may like children very much. However, some people question whether Song Joong Ki is not considerate, because the woman is an elderly woman and the risk of having a second child is very high. Song Hye Kyo is still single, and their marital status is in sharp contrast.

Learn some mind every day! Thanks to AI for teaching me to speak with high emotional intelligence! Say goodbye to clumsiness and solve communication problems with one click →

Editor in charge:

　　[car home Technology] powershift, in the impression of most people, is just equivalent to a swordsman with high kung fu in martial arts novels (such as seeking defeat alone? )-The evaluation we can give is: fast, fast, very fast. Moreover, this kind of transmission is direct enough and efficient enough, and it is like a master who never drags his feet … but why is it fast? Why is it efficient? What is its control principle? Is it really advanced? Want to know the answer? You don’t have to go to Baidu. car home has already opened powershift’s coat for you here-ladies and gentlemen, look for the answers you want in front of the naked transmission.

> > > Special note: 1. This paper only dissembles the DSG gearbox objectively, and does not comment on the phenomenon.

　　2. Regarding the topic of stability and fault that users are concerned about, we will explain it for you in the following follow-up articles. There is a notice at the end of the article. Please leave a message and participate in the discussion if you have any questions or faults about the dual clutch gearbox!

　　As usual, first of all, briefly introduce the protagonist of this "dedication": Volkswagen DQ200 dual-clutch gearbox-the first Volkswagen DSG gearbox made in China.

● Get familiar with DQ200 gearbox quickly? Manual gearbox? Dual clutch gearbox?

　　Before we begin, we need to form an awareness of the dual-clutch gearbox in our consciousness. If you still don’t know what the gearbox is and how the basic manual gearbox works, we have prepared the following aperitif wine for you, please taste it first.

　　After understanding the structure of the manual gearbox, it is much simpler for us to understand the dual-clutch gearbox. In principle, the dual-clutch gearbox is equivalent to the combination of two manual gearboxes, one controls the odd gear, the other controls the even gear, and the reverse gear is queued according to the situation (in the DQ200 7-speed dual-clutch gearbox, the reverse gear is regarded as a group with the even gear). Then, one set can be added to the combination of these two manual gearboxes. Hong Gong, a well-known Volkswagen engineer in the media circle, used "two manual boxes and one set of automatic dialing" to vividly compare the principle of dual-clutch gearbox. The following video will help you to understand our metaphor more intuitively, and also help you to face the various parts that will be disassembled from DQ200 more calmly.

"『DQ200 gearbox principle demonstration video-in order to save your time, it is suggested thatAfter 1 minute and 12 seconds,Start watching "

　　With regard to the origin and evolution history of the concept of "dual clutch", we also give it to you as an appetizer. Please click the link below to see the ups and downs of the dual clutch so far.

● Actual disassembly of DQ200 transmission: three modules-two "powerful" and one "calculated"

　　Metaphor is metaphor. When we really put DQ200 in front of you, you can’t really see a product that is directly combined with "two manual gearboxes and one controller". The previous section is only for everyone to understand the principle of dual-clutch gearbox.

　　Judging from the actual structure of the gearbox, the main number of members of DQ200 powershift is still "three" (of course not MT+MT+ controller …). These three modules have different division of labor, and two of them are only responsible for "hard work". They are dual clutch modules and gearbox parts, and all they have to do is to transmit power, commonly known as "force". The third part is the "source of wisdom" of the dual-clutch gearbox-the electromechanical control module, but in fact it is both mental and physical-it can be said that it is both a director and an actor. What are the specific tasks and characteristics of these three modules? We interpret it by disassembling it.

● Dual clutch module: I have a foreign ID card!

　　Let’s get to know the dual clutch module with German ID on DQ200. Since powershift took his last name, you can imagine how important this guy is.

"The dual clutch module is provided by the Luk brand of Schaeffler, Germany."

　　The dual clutch module is simply two sets of clutches+one shell. We call the clutch near one end of the engine K1 clutch, and the clutch behind it K2 clutch. The two sets of clutches K1 and K2 have their own independent driven parts (friction plate+driven plate+shock absorber+driven hub), pressing mechanism (diaphragm spring, pressure plate) and operating mechanism (only the operating arm is mentioned here).

　　The double clutch housing, the driving disc in the middle of the housing, and the butterfly diaphragm springs and pressure plates of K1 and K2 are all "best friends" of the engine, and there is no relative rotation between them. The double clutch housing is connected with the engine flywheel and rotates synchronously with the engine, and these components are called "driving parts".

　　The diaphragm spring and pressure plate which rotate together with the clutch housing play an important role. Under the lever action of the control arm, the sleeve is pressed to deform the diaphragm spring, and the resulting deformation pushes (or pulls) the pressure plate to press the friction plate. At this time, the driven plate and the aforementioned driving part become a whole. With the synchronous rotation of the engine, after the power is obtained from the clutch, the driven plate relies on the internal spline to transfer the power to the input shaft, and the power from the engine enters the gearbox.

● What you don’t know about DQ200(1)
-The working principle of the clutch is the same as that of the manual gearbox, but it works in the opposite way!

　　Speaking of butterfly diaphragm spring, I have to say that this DQ200 dry dual clutch is very interesting in control mode and principle. It is consistent with the familiar manual gearbox principle, which also relies on extrusion and friction to realize the continuous transmission of power, and also uses the lever principle to squeeze the sleeve to deform the diaphragm spring. However, the diaphragm spring works in the opposite way to the diaphragm spring in the manual transmission clutch (see the dynamic diagram above). In the single-chip clutch structure of manual transmission, when the diaphragm spring is squeezed, the clutch pressure plate will be released and the power transmission will be interrupted; In DQ200 gearbox, the function of diaphragm spring when it is squeezed is actually to press the clutch to turn on the power! To put it bluntly, the clutch of the manual gearbox is-You give an external force, it separates,The clutch of this DQ200 dual-clutch gearbox is just the opposite.You give an external force, it will engage!The "disengaging bearing" and "disengaging lever" in the traditional clutch should be renamed as "engaging" XX here. …

● Gear box: double MT combined body

　　After the power enters the gearbox from the input shaft, it will begin to travel between gears. The gear camp in the box is very easy to divide-like two sets of manual gearboxes-two input shafts and two output shafts, and then a set of parking locking mechanism and a differential to transmit power to the wheel axle are added. In this way, you will find that the dual-clutch gearbox is actually just a few more shafts than the traditional manual gearbox. As we have previewed before, the shifting principle of DQ200 and manual gearbox is completely consistent, and the shifting fork pushes the engaging gear sleeve to complete the combination or separation of gears (shifting gears).

　　The two input shafts are respectively connected with the K1 clutch and the K2 clutch, and the internal and external coupling mode is adopted. The first input shaft is equipped with a 1357th gear, and the second input shaft is equipped with a 246R gear. When the two clutches work alternately, the power can be connected between the odd gear and the even gear. Take a closer look at the input shaft, and you will find another interesting thing. On the first input shaft, the gears corresponding to the 1357th gear are independent, while the second input shaft corresponding to the 246R gear has only two gears. The 4th gear and the 6th gear share one input shaft gear, and the 2nd gear and the R gear (reverse gear) share one input shaft gear. Perhaps the purpose of this design is to ensure that the hollow second input shaft can have enough strength and ensure the gearbox.

● What you don’t know about DQ200 gearbox (2)
-What’s the difference between the "N" gear (neutral gear) of the dual clutch gearbox and the manual gearbox?

　　Many netizens want to know the difference between the "N" gear of the dual clutch gearbox and the neutral gear of the manual gearbox. Take the DQ200 gearbox we disassembled as an example. Its logic in the "N" gear is indeed different from the "neutral" of our usual manual gearbox. Simply put,The "neutral" of the dual clutch gearbox is equivalent to the state that the manual gearbox is "engaged in 1st gear and engaged"., so that the speed will be faster when the power is engaged. Moreover, in the D-range mode, when the brake is stepped on for a long time, the clutch will also be automatically disconnected, and the gear engaging sleeve is still engaged with the 1st gear.

　　In addition to various shafts and gears, the gearbox body also has a part that we can’t ignore-the parking control module, that is, the "P" gear control mechanism of our vehicle. The parking gear is integrated on the third output shaft, coaxial with the reverse gear, and it is the only gear with internal splines (synchronized with the output shaft).

　　The parking control mechanism is the only one physically connected with the gear lever on the DQ200 gearbox (all other controls are transmitted by electrical signals). When we put the gear lever into the "P" gear, the gear lever is controlled by the cable, and the connecting ball pin is pulled to make the pawl buckle the parking gear, thus locking the output shaft and achieving the purpose of parking locking.

● Electromechanical control module, with developed "six limbs" and not simple mind.

　　The hardest part of the three is naturally the electromechanical control module, which is "both output and calculation". This way of working is simply a typical "IT migrant worker".

　　From the structural point of view, its composition is not complicated. The sensor, arithmetic/control chip, hydraulic unit and actuator are just four pieces of content, which is also a simple number. The electromechanical control module relies on these components to complete the whole process of obtaining information-judgment/decision-making-execution. Among them, the hydraulic pump and pressure storage tank composed of gear pump are the source of all power for the electromechanical control module, and if human organs are used as an analogy, this is the heart.

　　We humans move through four limbs. The electromechanical control module of DQ200 has six limbs, which control the operating arms of K1 and K2 clutches respectively, and the other four limbs are used to control the shift fork. Four independent fork control levers control five forks (six gears and reverse gears are two forks sharing a fork control lever), and it is the existence of independent control levers that makes it possible to engage adjacent gears in advance.

　　The "brain" that gives action instructions to limbs is provided by Continental, Germany. This brain judges the driving state of the vehicle and the driver’s intention through the engine speed sensor, the output shaft speed sensor and the operation made by the driver on the gearbox control lever, and shares a series of information on the CANBUS bus, such as vehicle speed, wheel speed, accelerator pedal position, steering angle sensor, lateral acceleration sensor and so on, and makes a response. Sensors located at the fork and clutch actuator always remind the German brain of the clutch that the gearbox is currently working and the gear that is currently combined. At the same time, according to the oil temperature sensor and oil pressure sensor in the electromechanical control module, whether the working state of the gearbox is normal or not can be monitored in time. We can imagine that this information processing ability is hopeful to challenge the popular dual-core smart phone …

● What you don’t know about DQ200 gearbox (3)
-even without a double clutch, it can be fast!

　　The reason why the dual clutch gearbox is fast enough is not only because it is as simple as a "dual clutch module", but also largely due to its independent shift control lever. Do you know what "independence" means? This means that even if there is no double clutch, since DQ200 adopts the design that the interval gears share a joint sleeve (as mentioned above), the joint sleeves of adjacent gears can operate independently, and theoretically, "the joint sleeves of one gear can be disengaged while the joint sleeves of adjacent gears are engaged!" Do you know what is the core system of Lamborghini’s ISR gearbox (the gearbox with a shift time of 50 milliseconds)? In fact, it is a number of forks that can be controlled independently!

"The reason why Lamborghini’s ISR gearbox dares to challenge the serial gearboxes of the previous supercars.
It is also because it adopts an independently controlled shift fork.

　　(This paragraph is purely for discussion, and fans are welcome to speak enthusiastically.) The effect of this independent control is more flexible than that of the mechanical multi-fork synchronous action mode relying on the "shift drum" of the sequential gearbox, especially in the case of "trip stop" (except for odd-numbered trip stop …), while the shift drum mechanism can quickly switch between adjacent gears by relying on the servo motor with quick response, but when multiple gears are shifted up or down (for example,

● DQ200(4 you don’t know (4)
-the gearbox needs to use two kinds of oil at the same time!

　　Most automatic gearboxes and even dual-clutch gearboxes only use one kind of oil, which not only needs to realize the functions of lubrication, heat dissipation and torque transmission, but also needs to provide the hydraulic pressure required by hydraulic control components. DQ200 dual-clutch gearbox adopts independent dual-oil circuit design, and different oils are applied in the two oil circuits. In the gearbox, the gear oil of model G052171 is used, which is consistent with the gear oil used in the domestic Volkswagen MQ250 manual gearbox, while the hydraulic oil of model G004000 is used in the electromechanical control module. The two oils can better play their own functions in their independent oil circuit circulation, so that the gearbox has better low-temperature working characteristics.

　　Moreover, the total oil consumption of DQ200 is only 2.7L (1.7L of gear oil and 1L of hydraulic oil), which is nearly half of that of traditional automatic gearbox and wet dual-clutch gearbox. Needless to say, DQ200 is a maintenance-free design, even if it needs maintenance later, it has obvious advantages in cost. (It is said that the oil consumption of DQ250 wet dual clutch gearbox is more than 6L, and the total oil consumption of DQ200 is less than half.)

● DQ200(5 you don’t know (5)
-What’s the difference between DQ200 (7-speed dry dual clutch) and DQ250(6-speed wet dual clutch)?

　　I believe everyone knows the most obvious difference between DQ200 and DQ250, that is, the difference between "wet and dry" clutches. DQ250 uses a wet clutch, and the control method of the clutch is completely different. DQ200 relies on hydraulic pressure to push the control arm and presses the clutch plate by the diaphragm spring, while the clutch engagement of DQ250 is completely controlled by hydraulic pressure. DQ250 designed with a wet clutch uses a single oil, because of its large consumption. Therefore, the oil tank is designed, and it has pressure oil filter, oil cooler and oil pump driven by crankshaft power, which DQ200 does not have.

　　In addition, due to the different number of forward gears, the 7-speed DQ200 has three output shafts, the reverse gear and the parking gear alone occupy one output shaft, while the DQ250 has only two, and the parking gear of DQ250 is integrated on the differential.

Summary:

　　After reading the disassembly article of DQ200, I believe everyone has a deeper understanding and cognition of this 7-speed dry dual-clutch gearbox.Personally, the dual clutch gearbox is not complicated in principle or structure, and the structure based on manual gearbox is the fundamental reason for its high transmission efficiency and low fuel consumption.The design idea of DQ200 dual oil circuit and dual oil is one of its highlights. The two independent oils have more advantages in functional adaptability, and the total oil consumption of 2.7L is also a figure worth showing off.

　　Of course, all advanced and fresh technologies always need to face people’s doubts and challenges, and our users still have various questions about "dual clutch". In the next article, we will answer the hot issues of gearbox reliability, price, maintenance and so on that are concerned by the majority of riders, and present more "DQ200 dual clutch gearbox you don’t know" for you. Please pay attention to our later content! (Text/car home Fan Xintu/car home Liu Wei Liu Yuhui)

Extended reading:

● Automobile technology is difficult to understand? Car design is too far away? Who said that? These contents can also be very interesting!

> > Want to know more about cars and become a talent? Let’s go to car home Science and Technology! <<

Title: Proposal on Accelerating the Improvement of Terminal Service System in Urban and Rural Express Industry
First sponsor: Sun Buxin, Yan Jun, Xu Jin, Sun Yunfeng.
Organizers: Post Office (main), Ministry of Agriculture (meeting), Ministry of Public Security (meeting) and Ministry of Housing and Urban-Rural Development (meeting).
Form of proposal: individual joint name
Content:
　　　　Express delivery industry is an important part of modern service industry, and it is a modern leading industry that promotes the transformation of circulation mode and the upgrading of consumption. Express delivery industry is the fastest growing emerging service industry in recent years.
　　　　According to relevant statistics, in 2007, China’s annual express delivery volume was more than 1.2 billion pieces, in 2014 it was 14 billion pieces, and by 2015 it had exceeded 20 billion pieces. During the "Twelfth Five-Year Plan" period, the average annual growth rate basically exceeded 50%, and the development was very rapid. According to the goal of "Several Opinions of the State Council on Promoting the Development of Express Industry" issued by the State Council on October 23, 2015, by 2020, the annual business volume of express delivery will reach 50 billion pieces and the annual business income will reach 800 billion yuan.
　　　　The development of express delivery industry has reduced the circulation cost, not only promoted the development of e-commerce, provided convenience for people’s lives, but also promoted the development of modern agriculture, advanced manufacturing, financial industry and other industries. It can be said that the express delivery industry is a new achievement of internet plus’s new economic format, and it is an indispensable part of building a city life service circle, serving people’s livelihood and serving economic development.
　　　　First, the status quo and problems of express terminal service
　　　　Taking the city as an example, institutions and schools are concentrated, and large-scale residential areas, commercial areas and comprehensive office areas of enterprises and institutions are constantly emerging. The demand for express delivery services for unit users and individual users is large, demanding and personalized. The current delivery service mode does not match the property management pattern, causing a series of conflicts.
　　　　1, the contradiction between service demand and service capacity building lag.
　　　　In schools, communities, institutions and other units in the city, the problems of express terminal service are mainly manifested in: based on the security considerations of property (or logistics) management, there are access restrictions on express employees; The unit mailroom refuses express mail; There are no public facilities to accept express mail.
　　　　Lagging infrastructure construction, lack of public service platform construction, setting up stalls at delivery terminals, and road sorting have become the key points to be urgently studied and solved in express delivery development and urban construction.
　　　　2. Express service in remote villages needs government support.
　　　　Due to the scattered population in rural areas and the different characteristics of economic development in different regions, the development of express delivery business is unbalanced and the demand is relatively scattered, and the cost of collecting and delivering express delivery enterprises is relatively high. In order to guarantee the service standard and gain a firm foothold in the rural market, the express delivery enterprises basically adopt the way of self-building and co-building service outlets, and subsidize the delivery of parts to rural outlets. From provincial and municipal distribution centers to rural counties, it is basically necessary to ensure 1-2 express buses every day. Express delivery to remote towns and villages adopts common distribution, entrusted collection and delivery by EMS.
　　　　With the development of e-commerce, the demand for online shopping in rural areas has increased sharply, but it has not yet formed a two-way convection of products going to cities and countryside. For example, there are many old and weak people in the western region, and consumption is the main thing. The existing express service facilities and service system of enterprises can not meet the needs of users, so the government needs to cultivate the market and give some support to promote development.
　　　　3. Express service is facing a big bottleneck in urban areas.
　　　　People working and living in urban areas are dense. The closer to the city center, the more concentrated the demand for express delivery, and the area under the jurisdiction of the unit needs more express delivery services. Faced with the pressure of traffic and the severe challenge of strong demand for express delivery service every day, express delivery and terminal delivery have become important factors affecting service level and quality in recent years.
　　　　Second, suggestions
　　　　Express terminal service is an important part of express service, and it is an important embodiment of industry development benefiting people and serving people’s livelihood. We should give full play to the enthusiasm and initiative of relevant government departments, trade associations, enterprises and other parties, establish a working pattern of government-led, association-guided, enterprise-led and public-supported, implement "Several Opinions of the State Council on Promoting the Development of Express Industry", and study and introduce targeted support measures to promote the healthy and sustainable development of express industry.
　　　　1. Improve the legal planning system. The national "Express Regulations" will be promulgated this year, and all provinces should speed up the promulgation of the implementation opinions of the "Express Regulations" in this province; Incorporate the development of express delivery industry into the national economic and social development plan, rationally arrange the layout and construction of express delivery processing centers, convenience service outlets and other infrastructure in urban and rural planning, land use planning and public service facilities planning, and incorporate the supporting construction of express logistics common distribution stations and intelligent express (parcel) boxes into the urban community development plan.
　　　　2. Promote the construction of the terminal public service platform system for urban and rural express delivery. Business, rural areas, education, social construction, housing construction and other departments, together with postal administration departments, seriously study and give priority support to the inclusion of express service industry in the priority development industries related to people’s livelihood in the region, incorporate express terminal delivery service into the urban distribution system, support the construction of public service facilities such as logistics (express delivery) distribution stations and intelligent express boxes, and encourage community properties, village-level information service stations (points) and convenience stores to provide express delivery services. Support the extension of express delivery service network to rural areas, support express delivery enterprises or third-party services to focus on entering campus, communities, buildings, institutions and villages, and improve the last mile delivery service of express delivery with common distribution and intelligent express boxes as the main modes. All government departments should strengthen coordination and give special funds and policy support.
　　　　3. To promote the standardization and professional development of urban express delivery vehicles, the national standard for express tricycles should be formulated as soon as possible. Traffic management departments should formulate and implement measures for the management of urban express vehicles, express electric tricycles and other vehicles, rationally plan the route of express delivery vehicles and the loading and unloading locations of express mail, strengthen the demand management of urban distribution capacity, and ensure the convenient passage of express delivery vehicles; Encourage the use of clean energy vehicles to carry out express delivery business, and support the construction of facilities such as charging and refueling.
　　　　
Source: China Political Consultative Conference Network

　　Everything is for the safety of people’s lives and property ―― On-the-spot report on Fujian’s defense against typhoon "Seagull" 　

　　At about 14: 20 on July 18th, it was stormy in Xiapu section of Fujian Province, shenyang-haikou expressway. According to the latest news from Fujian Meteorological Observatory, the strong tropical storm "Seagull" landed in Changchun Town, Xiapu County, Fujian Province at 18: 10 on the 18th, with a central air pressure of 988 hectopascals, a maximum wind force of 10 near the center and a wind speed of 25 m/s.. Xinhua News Agency reporter Jiang Kehong photo

　　Xinhuanet Fuzhou, July 19 (Reporter Tu Hongchang, Lai Jianqiang, Kang Miao) At 18: 10 on the 18th, the "Seagull" which caused great disaster in Taiwan Province landed again in Mindong and entered Zhejiang in the early morning of the 19th. Although the intensity of the storm continued to weaken, it still triggered a large-scale rainfall in northern Fujian and southern Zhejiang.

　　Faced with the challenge of violent storms, Fujian quickly blew the "assembly number" to protect people’s lives and property. A series of tight and orderly anti-resistance measures have achieved good results. Up to now, the province has not found any casualties caused by typhoons.

　　"Seagull" is threatening.

　　This year’s No.7 typhoon "Seagull" was generated on the Philippine ocean at 14: 00 on the 15th, and then all the way to the northwest. At 21: 40 on the 17th, "Seagull", which gathered huge energy at sea, landed in the south of Yilan County, Taiwan. The sudden storm brought severe tests to Taiwan Province, which has always been well-trained in typhoon prevention and resistance.

　　According to statistics, from 17th to 18th, the main rainfall areas in Taiwan Province were concentrated in the area from the south of Miaoli to Pingtung, including Chiayi, Nantou, Tainan and Kaohsiung, with accumulated rainfall exceeding 1000mm. "Seagull" not only brings a lot of rainfall, but more seriously, the rainfall is very concentrated, which makes the flood worse and makes the drainage system in some cities unbearable.

　　According to the disaster report on Taiwan Province Island, the "Seagull" attack has caused 16 deaths, 11 missing, 673,000 families to stop water supply, many traffic trunk roads have been interrupted, some trains on the western trunk line of Taiwan Railway and high-speed rail have been stopped, flights at Taichung Qingquangang Airport have been suspended, Mazu’s foreign air and sea traffic has been interrupted, and Taiwan Province’s agriculture, forestry and animal husbandry have lost more than NT$ 110 million.

　　After passing through Taiwan Province, "Seagull" weakened from a typhoon to a strong tropical storm, and gradually approached the coastal areas of northern Fujian and southern Zhejiang. From 17: 00 on the 17th to the morning of 18th, Fujian Meteorological Observatory issued four typhoon yellow warning signals, saying that from 18th to 19th, some counties and cities in Fujian had heavy rain or rainstorm, and some counties and cities in Ningde and Fuzhou had heavy rain. "Seagull" affects Zhejiang Province during the flood season, which is prone to the phenomenon of wind, rain and tide, aggravating the harm. Therefore, the Zhejiang Flood Control and Drought Relief Headquarters started the typhoon-proof level II emergency response at 20: 00 on the 17th.

　　"’Seagull’ is generated offshore and moves fast. The radius of the 7-level wind circle reaches 300 kilometers. Landing at any point in Fujian will cover the whole of Fujian Province, and the resulting heavy rainfall will have a greater impact on Fujian, which requires the prevention and resistance work to be swift and rigorous." Wu Jinta, deputy director of the Fujian Provincial Flood Control Office, said.

　　From the 18th, Fuzhou swept away the sunny and hot weather a few days ago. The sky was cloudy with frequent showers, and large and small streams of water quickly appeared on both sides of some low-lying streets. Wang Chengdong, a citizen of Gulou District, went to the supermarket early in the morning to buy a refrigerator of vegetables and fruits. He said, "It is not convenient to go out when the typhoon comes. Stay at home on weekends and get ready for’ food and grass’."

　　After a long-distance attack of more than 1,000 kilometers at sea, at 18: 10 on the 18th, the "Seagull" with the maximum wind force of 10 near the center landed on the coast of Changchun Town, Xiapu County, Ningde City, Fujian Province again. The dark clouds hung low at the head of Xiapu County, and the roaring sea breeze blew the residents’ glass windows. Less than an hour after "Seagull" landed, the rain in Xiapu County gradually increased, and Xiapu’s transportation lines to other places, such as highways, national highways and maritime passenger routes, were blocked.

　　More than 300,000 people were transferred.

　　"The waves are so flat and there is no rain. Why can’t we go back to the fishing raft?"

　　"Now that the wind is back to the south, it may attack Sandu’ ao head-on, and it must be transferred immediately!"

　　At about 16: 00 on the 18th, Yang Shanbao, a fisherman in the Qingshan sea area of Sandu ‘ao, Jiaocheng District, Ningde City, refused to board the boat in the face of the mobilization of reserve officers and soldiers and town cadres. Seeing that the "seagull" was about to strike, Lan Tingjia, secretary of the Party Committee of Sandu Town, gave an order and took decisive measures to forcibly transfer it to a patrol boat and send it to a safe land for resettlement.

　　It turned out that at about 10: 00 on the 18th, "Seagull" turned northward to the coastal area of Zhejiang, and the sea area of Sandu was calm. More than 300 farmers thought that the typhoon would not reach Sandu, so they secretly ran back to the fishing raft. At about 13: 00, the typhoon returned to the south and attacked the coastal area of eastern Fujian. The cadres patrolling the sea found these secretly returning farmers, immediately mobilized them to go ashore, and forced them to transfer according to law. "The safety of people at sea is the most threatened by typhoons. Organizational transfer must be deployed in advance and implemented one by one, leaving no dead ends." Lan Tingjia said.

　　Wu Jinta said that according to the typhoon prevention plan of Fujian Province, people were transferred in steps during the typhoon, first the people on fishing boats and rafts, and then the people in low-lying, riverside, hillside and geological hazards. According to the statistics of Fujian Flood Control Office, as of 10: 00 on the 18th, more than 183,000 offshore workers had been safely transferred in Fujian province, including 29,300 offshore fishing rafts and 154,000 offshore vessels who entered the harbor to avoid the wind. According to the statistics of the National Flood Control and Drought Relief Headquarters, as of 10: 00 on the 18th, Wenzhou, Taizhou, Ningbo and Zhoushan in Zhejiang Province had transferred 170,000 people and returned to Hong Kong with 26,588 sheltered vessels.

　　Before the "Seagull" landed, more than 11,000 ships in Ningde City returned to Hong Kong in time to take shelter from the wind, and more than 15,000 fishermen were transferred to safety. A fisherman from Cangnan County, Zhejiang Province, told the reporter that it was because Ningde promptly informed all the vessels operating in the nearby waters to enter the harbor to take shelter from the wind before the typhoon landed that it escaped the strong tropical storm "Seagull".

　　Chen Rongkai, secretary of the Ningde Municipal Party Committee, said that after the typhoon landed, the gust of the sea near Xiapu County was still 9-10, and the secondary disasters caused by wind and rain still existed. Ningde City continued to maintain a high degree of vigilance and shifted the focus of its typhoon prevention work to the prevention of heavy rainfall. From the night of the 18th to the day of the 19th, it once again conducted a dragnet investigation on 1,390 hidden danger points of geological disasters in the city, focusing on preventing geological disasters such as mudslides and flash floods, and promptly transferring more than 140,000 people in various dangerous areas.

　　Huang Shuihua, an 80-year-old old man from Sandu ‘ao, Jiaocheng District, Ningde City, was transferred from a house in a low-lying area to a safe area in the urban area the day before the typhoon landed. The old man Huang Shuihua told reporters: "The people we transferred here have food, clothes, a place to live, clean water to drink, and timely treatment when they are sick, which is the blessing of the party and the government."

　　Good mechanism to ensure "near misses"

　　On the morning of 18th, Chen Jianping, director of Fuzhou Municipal Bureau of Organs Affairs, suddenly received a free mobile phone message: "According to the forecast of the Provincial Meteorological Observatory, Typhoon’ Seagull’ is expected to approach the coastal areas of northern Fujian and southern Zhejiang on the night of 18th, so please take precautions." Chen Jianping immediately launched the emergency plan of the unit, and arranged all the work to prevent and resist Typhoon No.7 "Seagull". Xiao Zhang, a citizen who temporarily went to work in Fuzhou Municipal Bureau of Organs Affairs, also received the same message and quickly informed his family.

　　Timely and transparent information disclosure is a major feature of typhoon prevention in Fujian Province. The Fujian Provincial Flood Control Office revealed that by more than half an hour before "Seagull" landed in Changchun Town, Xiapu County, Fujian had sent 5.15 million pieces of typhoon prevention public welfare information to mobile phone and PHS users in the province.

　　Fujian, with "eight mountains, one water and one field", is a province with frequent geological disasters, so the mountainous areas and rural grassroots are also greatly affected by typhoons and heavy rains. According to meteorologists, under the influence of seagulls, heavy rains and torrential rains have occurred in most counties and cities in Fujian Province, and the rainfall in 21 counties, cities and districts has exceeded 100 mm, so geological disasters are more likely to occur in some areas.

　　Qiu Tingmeng, spokesman of Fujian Flood Control and Drought Relief Headquarters, said that in order to strengthen the ability of grassroots villages to resist Taiwan and reduce disasters, Fujian Province has implemented the working mechanism of "early warning to the township, planning to the village, and responsibility to the people" this year. First, each township is equipped with a disaster prevention information receiving and republishing platform, and the early warning information is immediately transmitted to the relevant villages, units and flood control responsible persons through telephone, SMS and radio. Second, each administrative village should prepare relevant typhoon emergency plans; Third, the responsibility of each link in the typhoon prevention plan should be implemented to individuals.

　　In order to prevent the rainstorm and its secondary disasters, Zhang Changping, executive vice governor of Fujian Province, stressed that it is necessary to warn the county and township about the rainfall two hours before the rainstorm, and all localities should officially launch the disaster prevention and mitigation mechanism of "early warning to the township and pre-planning to the village", pay attention to the prevention of local rainstorms and extremely heavy rainstorms, focus on guarding and patrolling the hidden danger points of major geological disasters, and strengthen inspection and watch over dangerous reservoirs, high-water reservoirs and reservoirs upstream of densely populated areas to ensure safety.

　　Chen Rongkai, secretary of Ningde Municipal Party Committee, said that after the typhoon landed in Changchun Town, Xiapu County, Ningde City, millions of people in Ningde City were "near misses" and no one died from the disaster.

　　Although the typhoon has crossed the border, the work of preventing and resisting heavy rain in Fujian Province has not been relaxed. On the evening of 18th, Lu Zhangong, secretary of Fujian Provincial Party Committee, demanded that cadres at all levels should still go deep into the front line and command from the front, so that the plan can be effectively implemented. According to the rainfall situation, secondary disasters such as possible landslides should be closely monitored and the masses should be transferred in time. It is necessary to strengthen the responsibility mechanism, "we cannot cause losses to people’s lives and property because our work is not in place."

Editor: Li Xingcun

"Juvenile Xue Baochai" Li Qin and "Adult Jia Baoyu" Yang Yang.

　
"Lin Daiyu" Jiang Mengjie is cute and pouting.

Yang Yang smile sunshine.

　　The new TV series "Dream of Red Mansions" is about to meet the audience in the Year of the Tiger. The young boys and girls coming out of the Grand View Garden are young and energetic, and they are deeply loved by major fashion magazines. Recently, a series of color digital blockbusters shot for a magazine by "adult Jia Baoyu" Yang Yang, "Lin Daiyu" Jiang Mengjie and "teenager Xue Baochai" Li Qin were exposed. In the picture, "Bao Daichai" looks like a ghost horse and staged a group of fashionable and lovely eight continuous shooting.

　　Before filming A Dream of Red Mansions, Yang Yang and Jiang Mengjie were still wet behind the ears, studying their dances at school. And a Dream of Red Mansions made them famous, and they contacted more people and things one after another, and their attitude towards things also changed a lot. Moreover, A Dream of Red Mansions also gave them an opportunity to strengthen their future direction, as Yang Yang said: "After filming a Dream of Red Mansions, it was like having a dream, and after waking up, their orientation was clearer".

　　A Dream of Red Mansions, the first of Four Great Classical Novels in China, has been sung for hundreds of years. It can be said that from the book to the present, and even in the future, it has lived in the "youth" era, full of vigor and vitality, and there is no aging. Yang Yang, Jiang Mengjie and Li Qin, who play Jia Baoyu, Lin Daiyu and Xue Baochai in the new version of A Dream of Red Mansions, are three young children who inject new vitality into A Dream of Red Mansions with their youthful faces and classical temperament.

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　　BEIJING, Feb. 19 (Liu Danyi) US President Biden has been in the White House for nearly a month. After the new official took office, Biden has signed dozens of executive orders, drastically reformed in the fields of internal affairs and diplomacy, and revoked many controversial policies of former President Trump.

　　It is not difficult for Biden’s government to liquidate Trump’s "political legacy", but there is still a long way to go to completely repair the "scars" left by Trump’s administration.

　　"America is back"

　　Biden’s main "remodeling" card?

　　During Trump’s administration, the United States withdrew from many international organizations and multilateral treaties. The "Trump era" has come to an end, but the "Trumpism" that gives priority to the United States is far from leaving.

　　After Biden took office, he intended to reverse the "retreat" of the past four years. He said that diplomacy will once again become the center of US foreign policy, declaring that "America is back".

　　&mdash; &mdash; Re-join the group

　　After Biden was sworn in as president of the United States on January 20, he immediately signed a number of executive orders, announcing that the United States would rejoin the Paris Agreement and the World Health Organization.

　　Biden said that the United States will respond to climate change in a way that has not been taken so far.

　　Biden sent a letter to UN Secretary-General Guterres on the same day, announcing the withdrawal of the US government from the World Health Organization. Biden said in his letter that WHO plays a key role in the global fight against the Covid-19 pandemic and the global public health threat.

　　On February 17th, local time, US Secretary of State Blinken said that the United States would pay more than $200 million in assessed contributions to WHO, including arrears during Trump’s administration.

　　In addition, the United States will return to the United Nations Human Rights Council as an observer. In June 2018, the Trump administration announced that the United States had withdrawn from the UN Human Rights Council, claiming that the UN Human Rights Council was "biased" against Israel and "unable to effectively protect human rights".

　　Biden wants to add Trump’s retired "group" back, but the negative impact of "retreating from the group" is difficult to make up in a short time.

　　According to expert analysis, we should not expect too much from the full return of the United States to the international community, because Biden’s term of office is only four years, and there is not enough time to quickly eliminate the consequences caused by Trump within one term.

　　The candidate for WTO Director-General, who had been dystocia because of the Trump administration’s opposition, was finally confirmed on February 15 after the Biden administration expressed its "strong support". Former Nigerian Finance Minister Ngozi Okonjo-Iveala finally won, while South Korean candidate Yu Mingxi, who had been supported by the Trump administration, had announced his withdrawal. However, the WTO Appellate Body, which was stopped under the obstruction of the Trump administration, has yet to return to the right track of multilateralism.

　　&mdash; &mdash; Repair relations and negotiate issues.

　　After taking office, Biden said that the United States will focus on restoring relations with NATO allies and countries such as Japan and South Korea. He announced the suspension of some US troop withdrawal plans in Germany, calling the American alliance "our greatest asset".

　　For Iran and Russia, the two "old rivals", the US government has also focused its attention on a number of focus issues.

　　Biden promised that after he took office, he would reverse Trump’s "dangerous failure" policy toward Iraq and seek the United States to rejoin the Iranian nuclear deal.

　　But the deadlock between the United States and Iraq is hard to break. The Iranian side insists that the lifting of US sanctions against Iraq is the prerequisite for Iran to return to JCPOA(Joint Comprehensive Plan of Action). Biden said that the United States will not lift sanctions to promote Iran’s return to the negotiating table. Who can take the first step is still unknown.

　　Compared with the uncertainty of the relationship between the United States and Iran, the United States and Russia have made progress in arms control. The Trump administration has responded negatively to the extension of the New Strategic Arms Reduction Treaty. After Biden took office, Russia and the United States started negotiations on the only remaining major arms control treaty between the two sides. The Russian Foreign Ministry issued a statement on February 3, saying that the New Strategic Arms Reduction Treaty was extended for five years.

　　On the same day, Blinken said that after the extension of the New Strategic Arms Reduction Treaty, the United States would interact with Russia in a way "in line with the interests of the United States" to discuss the possibility of reducing crises and conflicts.

　　&mdash; &mdash; Counter-terrorism strategy adjustment

　　Blinken issued a statement a few days ago, saying that from February 16th local time, the Yemeni Houthi armed forces were revoked as a "foreign terrorist organization".

　　On January 10, 2021, the then Trump administration announced that Houthi was listed as a "foreign terrorist organization" and a "specially recognized global terrorist" entity. Analysts worry that this move will have a negative impact on the international community’s humanitarian relief operations in Yemen and the United Nations-led peace process, further prolonging the Yemen conflict.

　　Biden intends to close the prison at Guantanamo Bay, Cuba, which currently holds about 40 suspects of terrorist activities.

　　Former US President Barack Obama promised to close Guantanamo prison, but failed to deliver during his tenure. After taking office in 2017, Trump overthrew his predecessor’s practice and kept the prison.

　　According to the report, the Biden administration will face resistance from Congress and legal restrictions. At the same time, it is also a difficult problem how to place the terrorist suspects in custody after closing the prison.

　　A stroke of a pen, but there is still a long way to go.

　　Biden reversed Trump’s tough measures internally.

　　In addition to diplomacy, in terms of domestic policy, Biden’s New Deal also refers to Trump and overturns its measures in the fields of economy and immigration.

　　&mdash; &mdash; Strengthen employment protection

　　On January 22, local time, Biden signed an executive order to revoke three orders issued by Trump in 2018, which weakened the employment protection for federal employees and limited the time for federal employees to handle trade union affairs with pay.

　　The Biden administration believes that Trump’s executive orders have damaged workers’ collective bargaining ability.

　　&mdash; &mdash; Suspend the construction of the border wall

　　The construction of the US-Mexico border wall is Trump’s outstanding "political achievements". On the first day of taking office, Biden issued an executive order to suspend the construction of all border walls.

　　On February 11, local time, the White House announced that Biden had cancelled Trump’s national emergency order for the construction of the border wall and stopped funding for the construction of the US-Mexico border wall.

　　The White House has repeatedly warned about the security risks faced by immigrants who try to cross the US-Mexico border for asylum. White House spokesman Psaki stressed that this is "still a dangerous journey" and "now is not the time to go to the United States".

　　&mdash; &mdash; Redefine the rules for treating immigrants.

　　In fact, nearly a month after taking office, Biden has signed a number of administrative documents related to immigration policy.

　　On February 2, local time, Biden announced the establishment of an inter-departmental working group to solve the problem of "separation of flesh and blood" of illegal immigrants. The Trump administration once implemented a "zero tolerance" policy for illegal immigrants. When border law enforcement officers arrested them, they forcibly separated their minor children, which triggered unanimous condemnation from all walks of life in the United States.

　　Four days later, Blinken announced that Biden’s administration had begun to terminate the immigration agreements signed by the United States with El Salvador, Guatemala and Honduras, and to reform the Trump-era asylum system. In July 2019, the United States signed agreements with the above three countries respectively, restricting the ability of some asylum seekers in these countries to apply for asylum in the United States and requiring them to seek protection in their countries of origin.

　　In addition, a number of people familiar with the matter revealed that the Biden administration and members of the Democratic Party of Congress may announce the immigration reform plan later this week, including giving 11 million illegal immigrants the opportunity to become naturalized and expanding the refugee resettlement plan.

　　Trump’s "public burden" immigration exclusion rule is coming to an end. This policy strictly restricts the issuance of green cards to poor immigrants who receive welfare.

　　Although Biden revoked many tough immigration policies of his predecessor in a short time, American public opinion pointed out that the Biden administration still has a long way to go before these policies "landed".

　　The Associated Press said, "Biden can cancel Trump’s policy with a stroke of a pen", but the real change of the US immigration system must be supported by Congress. This is an arduous task that Trump, Obama and George W. Bush failed to complete during their tenure.

　　Biden’s approach, at present, has not shown more novel and effective ideas. The most important and primary purpose of Biden’s administration since it took office is to "de-Trump" as soon as possible, to fish out the political legacy of the Democratic Party during the Obama era from the pile of old papers, and to make the political elites of the United States return to Washington "get used to it".