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Zheng Muyan of China competes during the women's 4X100m medley relay final at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina on Oct. 8, 2018. China won the gold with 4 minutes 5.18 seconds. (Xinhua/Zhu Zheng)

Zheng Muyan of China competes during the women's 4X100m medley relay final at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina on Oct. 8, 2018. China won the gold with 4 minutes 5.18 seconds. (Xinhua/Zhu Zheng)