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Chinese athlete Su Bingtian competes during the men's 4X100 meters relay heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Jia Yuchen)
Chinese athlete Su Bingtian competes during the men's 4X100 meters relay heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Jia Yuchen)