The US is in an "absolute race against time" to vaccinate as many people as possible before new Covid-19 variants take hold of the country, one expert said Sunday.
원문출처 : https://www.cnn.com/2021/02/01/health/us-coronavirus-monday/index.html
원문출처 : https://www.cnn.com/2021/02/01/health/us-coronavirus-monday/index.html