A man walks his dog along the Vistula river in Warsaw, Poland, on Jan. 19, 2021. (Photo by Jaap Arriens/Xinhua)
A woman wearing a face mask is seen in central Warsaw, Poland, on Jan. 19, 2021. (Photo by Jaap Arriens/Xinhua)
A woman with a face mask walks on a snow-covered boulevard along the Vistula river in Warsaw, Poland, on Jan. 19, 2021. (Photo by Jaap Arriens/Xinhua)
