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Gold medalist Sarah Sjoestroem of Sweden checks on the results after the women's 50m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Tao Xiyi)

Gold medalist Sarah Sjoestroem of Sweden checks on the results after the women's 50m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Tao Xiyi)