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Chairman and CEO of the Blackstone Group Stephen Schwarzman attends the 2017 China-U.S. Business Leaders Summit in Washington D.C. July 18, 2017. Jack Ma said here on Tuesday that Chinese and U.S. business leaders should join force to set for broader cooperation between the world's two largest economies in the future rather than focusing on "the problems of the past." (Xinhua/Ting Shen)