UK border control is seen at the Calais Port in France on Jan. 31, 2020. (Xinhua/Gao Jing)

Photo taken on Jan. 31, 2020 shows the Calais Port in France. (Xinhua/Gao Jing)

Trucks wait to embark a ferry to Britain at the Calais Port in France on Jan. 31, 2020. (Xinhua/Gao Jing)

A ferry boat enters the Calais Port in France on Jan. 31, 2020. (Xinhua/Gao Jing)