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Vietnamese President Tran Dai Quang (R) shakes hands with Polish President Andrzej Duda in Hanoi, capital of Vietnam, on Nov. 28, 2017. (Xinhua/Wang Di)

Vietnamese President Tran Dai Quang (R) shakes hands with Polish President Andrzej Duda in Hanoi, capital of Vietnam, on Nov. 28, 2017. (Xinhua/Wang Di)