Stay 6 feet apart and, while you're at it, wear a face covering. While most countries around the world have instituted simple steps like these to help stop the spread of Covid-19, the scientific evidence behind them hasn't always been clear-cut and has, in the case of masks, sometimes been contradictory.
원문출처 : https://www.cnn.com/2020/06/01/health/review-masks-social-distancing-covid-19-wellness/index.html
원문출처 : https://www.cnn.com/2020/06/01/health/review-masks-social-distancing-covid-19-wellness/index.html