Climbing Covid-19 cases -- and particularly the increasing proportion reported in children -- are causing many health experts to worry about the outlook as the school year gets underway across the entire country.
원문출처 : https://www.cnn.com/2021/09/08/health/us-coronavirus-wednesday/index.html
원문출처 : https://www.cnn.com/2021/09/08/health/us-coronavirus-wednesday/index.html