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Workers wearing a protective gear correct garbage outside the hotel at which the athletes are staying for the test event of Beijing Winter Olympic Games in Zhangjiakou, Hebei Province, on Nov. 26, 2021. The a "closed-loop" bubble system as part of measures against the novel coronavirus are taken. ( The Yomiuri Shimbun via AP Images ) (KEYSTONE/AP Yomiuri Shimbun/Koki Kataoka)