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Gold medalist Sarah Sjoestroem (2nd L) of Sweden gets ready before the women's 50m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Wang Jingqiang)

Gold medalist Sarah Sjoestroem (2nd L) of Sweden gets ready before the women's 50m butterfly final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Wang Jingqiang)