美国批准更新新冠疫苗，以加强今秋保护力度
Voice of America
美国周一(9月11日)批准了经过更新的COVID-19疫苗，希望加强对新冠病毒最新毒株的预防，并遏制今年秋冬的任何感染激增。
（本文依据了美联社的报道。）
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