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U.S. President Donald Trump (Front) participates in a ceremony marking the 18th anniversary of the 9/11 attacks at the Pentagon in Arlington, Virginia, the United States, on Sept. 11, 2019. (Xinhua/Liu Jie)
U.S. President Donald Trump (Front) participates in a ceremony marking the 18th anniversary of the 9/11 attacks at the Pentagon in Arlington, Virginia, the United States, on Sept. 11, 2019. (Xinhua/Liu Jie)