Once one of the world's most powerful travel documents, the might of the United States passport has been diminished during the pandemic. With US Covid-19 cases past the 30.6 million mark, some nations continue to view vacationers warily.
원문출처 : https://www.cnn.com/travel/article/us-international-travel-covid-19/index.html
원문출처 : https://www.cnn.com/travel/article/us-international-travel-covid-19/index.html