What does COVID-19's contact with time and space mean?

"Space-time satellite" refers to the number of space-time satellites in the same space-time grid (the range is 800 m * 800 m) * * and the confirmed number stay for more than 10 minute, and the cumulative stay time of any number in the recent 14 days exceeds 30 hours.

10 On June 25th, Xi 'an held a press conference on joint prevention and control of epidemic situation in COVID-19, introducing this round of epidemic prevention and control: the total number of nucleic acid tests in the city was 9 190 10000, all of which were negative. By 8: 00 on the 25th, Xi 'an had managed 4,036 secret contacts and 7,690 secret contacts, and each control point involved 29,098 potential secret contacts and 7,627 time and space companions, all of whom were negative for nucleic acid detection.

On June 1 65438+1October1day, the Beijing Municipal Health and Health Commission issued a reminder message, telling those who are traveling or traveling outside Beijing to take good personal protection during the journey and eating, and pay close attention to the epidemic information in various regions of China. If there is time and space overlap with the reported cases in China, please report the itinerary to the community (village), unit and hotel immediately, and don't isolate yourself on the spot.