《晨讀10分鐘 英文閱讀能力UP》國際時事：美國即將施打疫苗第三劑/加強劑

原文連結:
1. Washington Post:Biden administration to offer vaccine booster shots beginning Sept. 20, require vaccinations for nursing home staff
https://www.washingtonpost.com/nation/2021/08/18/covid-delta-variant-live-updates/

2. CDC: COVID-19 Vaccine Booster Shot
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/booster-shot.html

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