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Gold medalist Regan Smith of the United States competes during the women's 200m backstroke final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Xia Yifang)

Gold medalist Regan Smith of the United States competes during the women's 200m backstroke final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Xia Yifang)