群体免疫也没用了，一个人不可能对所有毒株免疫，如果所有毒株都过一遍，人也死了。

来源: 7Sle 于 2020-04-25 08:36:01 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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