What does it mean to be a secret connection without accompanying time and space?

This is a new measure for epidemic prevention and control in COVID-19. In some places, a "yellow code" is given to the "space-time companion" at random, and it is required to go to the nucleic acid detection point designated by the "yellow code" for testing. This has brought a lot of inconvenience to citizens' lives. 165438+1On October 30th, Shenzhen and Guangzhou introduced optimization measures for prevention and control, emphasizing that "time and space are not closely connected".