What is the intersection of time and space?

Time-space intersection generally refers to time-space companion, which is a new term given birth to the COVID-19 epidemic. ?

It means that my phone number and confirmation number stay in the same space-time grid (the range is 800 m * 800 m) * * for more than 14 minutes, and the cumulative stay time of any number in recent 14 days exceeds 30 hours, and the found number is a space-time companion number.

Application of time-space intersection in epidemic situation;

Time-space intersection and another way of saying it, time-space accompaniment are the same concept, which means that within 14 days, the patient stays in the same time-space grid (usually 800 meters *800 meters as the detection range) for 10 minutes.

In layman's terms, for example, if the confirmed patient has been to Fuzhou within 14 days, the trajectory of you 14 days intersects with him. Whether it is physical transmission or drift of communication signals, it may be considered as a problem of time and space. The health code will turn yellow when the system detects that you are with the confirmed patient in time and space, and you belong to the time and space partner in the risk group. How to turn the yellow code of time and space partner into the green code? According to the requirements of nucleic acid detection, the health code returned to normal after the result was negative.

Because the concept of time-space intersection is adopted in epidemic prevention and control, some citizens are included in risk management even if they have no direct close contact with confirmed cases or close contacts.