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Gold medalists, athletes of the United States, pose for photos during the awarding ceremony of men's 4X100m at the 2019 IAAF World Athletics Championships in Doha, Qatar, Oct. 6, 2019. (Xinhua/Xu Suhui)

Gold medalists, athletes of the United States, pose for photos during the awarding ceremony of men's 4X100m at the 2019 IAAF World Athletics Championships in Doha, Qatar, Oct. 6, 2019. (Xinhua/Xu Suhui)