病毒變異是自然過程，傳染是篩選過程。碰上合適的宿主，傳播就快。如果宿主得到及時救治、有效隔離，便傳不下去了。

來源: fuz 於 2021-09-06 06:36:18 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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