Having a safe and effective vaccine is a turning point in the fight against the coronavirus pandemic. But there are many challenging steps ahead -- from making large quantities to delivery around the world -- before a vaccine can have an impact on the spread of the virus.
원문출처 : https://www.cnn.com/videos/health/2020/11/20/will-covid-vaccine-end-pandemic-lon-orig-na.cnn
원문출처 : https://www.cnn.com/videos/health/2020/11/20/will-covid-vaccine-end-pandemic-lon-orig-na.cnn