What does it mean that the living history of a risky city needs textual research?

This means that in the health code, you don't click Verify in the the State Council Travel Card. The specific itinerary is not displayed.

The solution is as follows: Solution: Click the Find Line Card in the health code, and after passing the face verification, the line can be automatically found when scanning the code on the same day. If the trip code is green, it means normal, and you have never been to a high-risk area, if the trip code is yellow or red. It means abnormal. An ambassador lives in a high-risk area.