Two of the top professional sports leagues in the country are tightening their Covid-19 protocols in response to the surge in cases.
원문출처 : https://www.cnn.com/2021/12/16/sport/nfl-covid-19-protocols-spt/index.html
원문출처 : https://www.cnn.com/2021/12/16/sport/nfl-covid-19-protocols-spt/index.html