A yellow health code indicates that COVID-19 may be infected. If the student's health code turns yellow, you should contact the local epidemic prevention department in time to deal with it, and those with yellow code will be restricted from traveling. Do not enter hotels, shopping malls, supermarkets, cinemas, KTV, bars and other crowded public places, and restrict travel by public transport (planes, trains, buses, etc.). The school belongs to a public place with many students and teachers. For students whose health code turns yellow, don't go to school for the time being, and do a good job in screening management and health monitoring.