Health experts warn the US may be on the cusp of another Covid-19 surge if Americans aren't careful -- just as the country races to vaccinate more people.
원문출처 : https://www.cnn.com/2021/04/04/health/us-coronavirus-sunday/index.html
원문출처 : https://www.cnn.com/2021/04/04/health/us-coronavirus-sunday/index.html