Why did you eat together? Some people receive information that travels through time and space, while others don't.

According to the investigation of the places where the infected person has been, you may have time and space intersection with the infected person in a short time. Using the concept of time-space crossing population in epidemic tracking can find the potentially dangerous population as much 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, and of course means that the workload of epidemiological monitoring has doubled. Receiving information means isolating at home for seven days, then informing or reporting to the community for further instructions, and finally doing 2-3 nucleic acid tests within seven days, all of which are negative before orderly flow. Try not to go out during the isolation period, and the property or community will help you.

The concept of "time-space intersection" is the same as that of "time-space companionship", which refers to the person who stayed with the diagnosed patient for 14 days in the same time-space grid (usually 800 m× 800 m as the detection range), and the cumulative stay time of any number in the recent 14 days exceeded 30 hours.

Space-time intersection in layman's terms, for example, if the infected person has been to a place within 14 days, 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 the intersection of time and space.