How did you find it at the same time?

In this way, check whether I have an intersection of time and space, that is, my phone number and confirmed number have stayed together for more than 10 minute in the same time-space grid with a range of 800 meters by 800 meters, and in the recent 14 days, the cumulative stay time of any number has exceeded 30 hours. If the number found is a space-time companion, my health code will turn yellow and be marked as a space-time companion by the system.

The intersection of time and space means the gathering and interweaving of time and space. It is often used to refer to two parallel different worlds, the past and the present, which have exactly the same things or connections at a certain moment. Space-time is an abstract concept and a basic concept of mechanics, physics, astronomy and philosophy. Refers to 14 days, staying with the confirmed patient in the same space-time grid 10 minutes. The intersection of time and space is a technical term of public security and telecommunications departments. Using the concept of time-space crossing population in epidemic tracking can find as many potential dangerous populations as possible, and bring more people who may be infected because of time-space crossing into epidemiological monitoring, which plays an important role in finding positive cases in time.