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American sprinter Christian Coleman attends the press conference one day ahead of the 2019 IAAF Diamond League in east China's Shanghai municipality on May 17, 2019. (Xinhua/Fang Zhe)

American sprinter Christian Coleman attends the press conference one day ahead of the 2019 IAAF Diamond League in east China's Shanghai municipality on May 17, 2019. (Xinhua/Fang Zhe)