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