Three yards and a certificate is what: "three yards" refers to the electronic health code (including the new coronavirus vaccination information), communication big data trip card and peer close personnel self-check information. The "one card" is the ID card, and if it is a school, you also need a student ID card. These things are nowadays we live during the travel important pass, many places like hospitals, shopping malls, etc., to enter is all need to show us their personal information. Epidemic personal hygiene attention: 1. In the single office environment staff in principle can not wear masks. Staff in multi-person office environments can not wear masks if the office environment is relaxed, well-ventilated, and the health status of each other is confirmed to be good. In other working environments or environments where the risk cannot be determined, masks should be worn, and single-use medical masks are usually recommended. 2. Always wash your hands or disinfect them with a hand sanitizer after touching potentially contaminated items. When returning home from an outing, always wash your hands first. 3. Keep the environment hygienic and clean, and remove garbage in a timely manner. 4. Public goods and public **** contact with goods or parts to strengthen the cleaning and disinfection.