無法取得資料https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200512-covid-19-sitrep-113.pdf?sfvrsn=feac3b6d_2
無法取得資料https://www.state.gov/additional-u-s-foreign-assistance-builds-upon-u-s-leadership-in-the-global-covid-19-response/
無法取得資料https://edition.cnn.com/2020/05/06/opinions/covid-19-fight-against-coronavirus-us-daschle-frist/index.html
無法取得資料https://www.worldpoliticsreview.com/articles/28751/the-world-order-after-covid-19-hinges-on-what-kind-of-america-emerges