A staff member gives sanitizing gel to a customer at a store in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

A sign reading "face masks and sanitizing gel are mandatory" is seen at the entrance of a store in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

A woman shops at the Christmas market in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

A woman carrying shopping bags walks on the street in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

A worker checks the health pass of visitors at the entrance of the Christmas market in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

The Christmas market is seen in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

A customer visits the Christmas market in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

People wearing masks ride on ferris wheel in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

People visit the Christmas market in Lille, northern France, Dec. 22, 2021. (Photo by Sebastien Courdji/Xinhua)

来源：Xinhua