Will you close the door after receiving the SMS link?

Yes People related to time and space, such as risk personnel, will receive short messages and should report to the community in time. After the report, the Health Expo will pop up a window to remind them to strictly abide by the requirements of community epidemic prevention and take measures such as home isolation. So I will close the door after receiving the SMS link. "Time-space intersection" is the same as "time-space companionship", which refers to the person who stays with the diagnosed patient for 14 days in the same time-space grid, and usually takes 800 m× 800 m as the detection range.