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1、 Social Security: Major Decisions in the House and Senate Since 1935 Updated February 19, 2021 Congressional Research Se。

2、 Congressional Review Act Issues for the 117th Congress: The Lookback Mechanism and Effects of Disapproval February 19, 。

3、CRS INSIGHT Prepared for Members and Committees of Congress INSIGHTINSIGHTi i COVID19 Vaccine: Financing for Its Adminis。

4、 https:crsreports.congress.gov Updated February 19, 2021Railroad Retirement Board: Retirement, Survivor, Disability, Une。

5、 https:crsreports.congress.gov Updated February 19, 2021Wildlife Trade, COVID19, and Other Zoonotic DiseasesIntroduction。