Less than a year ago, there was much debate on the effectiveness of wearing masks in preventing the transmission of Covid-19. Now, not only have masks been scientifically proven to work, new research says wearing TWO is even better. That is, at least, better than wearing a simple disposable surgical mask.
원문출처 : https://www.cnn.com/2021/02/11/world/coronavirus-newsletter-02-11-21-intl/index.html
원문출처 : https://www.cnn.com/2021/02/11/world/coronavirus-newsletter-02-11-21-intl/index.html