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Mujinga Kambundji (1st R) of Switzerland competes in the women's 60m semifinal during the IAAF World Indoor Championships at Arena Birmingham in Birmingham, Britain on March 2, 2018.(Xinhua/Han Yan)

Mujinga Kambundji (1st R) of Switzerland competes in the women's 60m semifinal during the IAAF World Indoor Championships at Arena Birmingham in Birmingham, Britain on March 2, 2018.(Xinhua/Han Yan)