A man wearing a face mask walks in the street during the COVID-19 pandemic in Stockholm, capital of Sweden, on Nov. 3, 2020. (Photo by Wei Xuechao/Xinhua)

A man wearing a face mask walks in the street during the COVID-19 pandemic in Stockholm, capital of Sweden, on Nov. 3, 2020. (Photo by Wei Xuechao/Xinhua)

A man wearing a face mask waits for a bus during the COVID-19 pandemic in Stockholm, capital of Sweden, on Nov. 3, 2020. (Photo by Wei Xuechao/Xinhua)

A man wearing a face mask waits for a train in the central train station during the COVID-19 pandemic in Stockholm, capital of Sweden, on Nov. 3, 2020. (Photo by Wei Xuechao/Xinhua)