Travel code/kloc-needs to be reapplied after 0/4 days, and health code (green code) needs to be reapplied after 3 days. The green code is asymptomatic, healthy and normal, and suspicious personnel flow and return to work and production. The validity period is 3 days, and you need to punch in your own card within 3 days, otherwise it may be converted into "Gray code". So be sure to wear a mask when you go out.