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Gold medalist Caeleb Dressel (R) of the United States prepares before the men's 50m freestyle final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Wang Jingqiang)

Gold medalist Caeleb Dressel (R) of the United States prepares before the men's 50m freestyle final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Wang Jingqiang)