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Police officers stand guard at the Times Square in New York, the United States, on Dec. 31, 2017. Security measures were tightened for the New Year celebrations in New York. (Xinhua/Wang Ying)
Police officers stand guard at the Times Square in New York, the United States, on Dec. 31, 2017. Security measures were tightened for the New Year celebrations in New York. (Xinhua/Wang Ying)