back to work. According to the relevant public information, as of February 28, 2122, the epidemic has been fully liberalized. Notice of the State Council Joint Prevention and Control Mechanism on Further Optimizing and Implementing the Prevention and Control Measures of COVID-19 Epidemic Situation shall not take any form of temporary control, and it is strictly forbidden to block fire exits, unit doors, residential doors and village groups in any way. If the high, medium and low risk areas are not divided, traffic control is cancelled, and all vehicles pass normally, so the unit returns to work normally, residents return to normal traffic, and residents do not check the trip code, health code and nucleic acid certificate when traveling.