有三種戰略可在兩月左右控製疫情，其中兩個實踐直接證明有效，一個間接證明有效。為什麽要選效果差的打疫苗方法呢？

來源: solo1 於 2021-05-06 10:52:30 [舊帖] [給我悄悄話] 本文已被閱讀：次

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