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People walk along the Dover Harbour in Dover, Britain, Jan. 30, 2020. Britain will leave the European Union (EU) on Jan. 31, 2020. (Xinhua/Han Yan)

People walk along the Dover Harbour in Dover, Britain, Jan. 30, 2020. Britain will leave the European Union (EU) on Jan. 31, 2020. (Xinhua/Han Yan)