The United States has been through waves, spikes and surges of Covid-19 throughout the pandemic, and now there is concern that the nation may be entering a new winter surge.
원문출처 : https://www.cnn.com/2021/12/10/health/covid-19-seasonal/index.html
원문출처 : https://www.cnn.com/2021/12/10/health/covid-19-seasonal/index.html