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Chinese swimmer Yan Siyu competes during the women's 800m freestyle heats of the national swimming championship in Qingdao, east China's Shandong Province, March 29, 2019. (Xinhua/Li Ziheng)

Chinese swimmer Yan Siyu competes during the women's 800m freestyle heats of the national swimming championship in Qingdao, east China's Shandong Province, March 29, 2019. (Xinhua/Li Ziheng)