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1、 The Bioeconomy: A Primer August 19, 2021 Congressional Research Service https:crsreports.congress.gov R46881 。

2、 https:crsreports.congress.gov August 19, 2021Liability Issues Related to COVID19 Vaccine Manufacturing and Global Distr。

3、 Labor Day Speech Resources: Fact Sheet Updated August 19, 2021 Congressional Research Service https:crsreports.congress。

4、 Defense Advanced Research Projects Agency: Overview and Issues for Congress Updated August 19, 2021 Congressional Resea。

5、 https:crsreports.congress.gov August 19, 2021Agriculture in the WTOs 12th Ministerial Conference MC12The United States 。