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Gold medalist Caeleb Dressel (Front) of the United States reacts after the men's 100m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Xia Yifang)

Gold medalist Caeleb Dressel (Front) of the United States reacts after the men's 100m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Xia Yifang)