老大藏在這裏信口開河呢？再次告訴你mRNA疫苗80%防delta感染，一般的外科口罩降低11%的感染風險。文獻早給你了啊！

來源: 業餘城管於 2021-09-24 17:06:38 [舊帖] [給我悄悄話] 本文已被閱讀：次

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