打疫苗+ 戴口罩，等於雙重防護，即便別人不戴口罩，被感染和發重症機會也能大大減低。

來源: pickshell 於 2021-05-14 10:24:33 [舊帖] [給我悄悄話] 本文已被閱讀：次

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