For more than a year, the US has battled a ruthless enemy: a novel virus that took no mercy on American communities, crippled hospital systems and took the lives of more than half a million people.
원문출처 : https://www.cnn.com/2021/04/09/us/us-covid-vaccines-mistakes-progress-analysis/index.html
원문출처 : https://www.cnn.com/2021/04/09/us/us-covid-vaccines-mistakes-progress-analysis/index.html