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Chinese Vice Premier Liu Yandong delivers a speech at George Washington University in Washington D.C. Sept. 28, 2017. The first China-U.S. Social and People-to-People Dialogue was held on Thursday in Washington D.C.. The event was co-chaired by visiting Chinese Vice Premier Liu Yandong and U.S. Secretary of State Rex Tillerson. (Xinhua/Yin Bogu)