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Shericka Jackson (2nd R) of Team Jamaica competes during the women's 4X100m relay final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 5, 2019. (Xinhua/Jia Yuchen)

Shericka Jackson (2nd R) of Team Jamaica competes during the women's 4X100m relay final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 5, 2019. (Xinhua/Jia Yuchen)