第一句改写一下：新冠病毒是RNA病毒，但是相对稳定，变异不大，所以疫苗是最好抗疫成功的关键。

来源: Kwseeto 于 2020-04-04 01:32:06 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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