What does it mean for people who have lived in high-risk areas in the past 7 days?

There are people who have been to the high-risk area within 7 days. For those who live in high-risk areas in the last 7 days, it means that people who stay in high-risk areas within 7 days are strictly restricted. High-risk areas, places where sick and asymptomatic infected people live, and areas with frequent activities and high risk of epidemic spread.