誰能解釋這句話：”新冠疫苗是可以預防疾病，但是，是否能預防感染，目前尚不清楚。“

來源: 米蘭之夜於 2021-03-10 12:26:22 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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