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People wearing face masks wait in line to buy groceries in Brooklyn, New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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People wearing face masks walk in the Brooklyn borough of New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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People wearing face masks are reflected in a window along the Fifth Avenue in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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People wearing face masks walk along the Fifth Avenue in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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A health worker carries soiled sheets and towels in front of the Maimonides Medical Center in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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Health workers wheel a patient on a stretcher out of an ambulance at the Maimonides Medical Center in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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Health workers wheel a patient on a stretcher at the Maimonides Medical Center in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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A man wearing a face mask jogs along the waterfront in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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People wearing face masks walk along the Fifth Avenue in New York, the United States, Jan. 5, 2021. The confirmed COVID-19 cases in the United States topped 21 million on Tuesday. (Photo by Michael Nagle/Xinhua)

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