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A trader works at the New York Stock Exchange in New York, the United States, July 31, 2019. U.S. stocks ended lower on Wednesday. The Dow decreased 1.23 percent to 26,864.27, the S&P 500 fell 1.09 percent to 2,980.38, and the Nasdaq was down 1.19 percent to 8,175.42. (Xinhua/Wang Ying)