British Prime Minister Boris Johnson leaves 10 Downing Street for the House of Commons in London, Britain, on Dec. 30, 2020. British lawmakers on Wednesday approved the post-Brexit trade deal between Britain and the European Union (EU) by a large majority, paving the way for an orderly Brexit when the transition period ends on Thursday. (Photo by Ray Tang/Xinhua)

British Prime Minister Boris Johnson leaves 10 Downing Street for the House of Commons in London, Britain, on Dec. 30, 2020. British lawmakers on Wednesday approved the post-Brexit trade deal between Britain and the European Union (EU) by a large majority, paving the way for an orderly Brexit when the transition period ends on Thursday. (Photo by Ray Tang/Xinhua)

British Prime Minister Boris Johnson leaves 10 Downing Street for the House of Commons in London, Britain, on Dec. 30, 2020. British lawmakers on Wednesday approved the post-Brexit trade deal between Britain and the European Union (EU) by a large majority, paving the way for an orderly Brexit when the transition period ends on Thursday. (Photo by Ray Tang/Xinhua)

British Prime Minister Boris Johnson leaves 10 Downing Street for the House of Commons in London, Britain, on Dec. 30, 2020. British lawmakers on Wednesday approved the post-Brexit trade deal between Britain and the European Union (EU) by a large majority, paving the way for an orderly Brexit when the transition period ends on Thursday. (Photo by Ray Tang/Xinhua)