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China's Su Bingtian competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Li Gang)

China's Su Bingtian competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Li Gang)