/kloc-will you receive a time-space message in 0/5 days?

Time-space companion refers to the person who is with the diagnosed patient in the same time-space grid (the range is 800 meters *800 meters) 14 days 10 minutes. In layman's terms, for example, an infected person has been to a place within 14 days, and the trajectory of your 14 days intersects with him. Whether it is a physical brush or a drift in communication signals, it may be considered as a problem of time and space.

Screening "time-space companions" can find the potentially dangerous population to the greatest extent, and include more people who are "time-space overlapping" and may be infected in key investigations, so as to truly achieve early detection and early prevention and control. Usually a few days. Don't worry.