What do you mean by scanning, checking and asking?

Scan the place code, check the hygiene code, check travel itinerary, check the negative certificate of 24-hour nucleic acid test+take temperature+wear a mask. "One sweep" means scanning the place code, and "three checks" means checking the health code, travel itinerary and nucleic acid test report. "One question" is to ask about the living history in COVID-19 within 7 days and whether there are any suspected symptoms such as fever, dry cough and sore throat. "One test" is to monitor body temperature.