什麽時侯達到群體免疫,一個月,10年?
群體免疫不等於放任不管。
• 這僅是基於統計模型假設,具體真正多久其效果如何,誰也不知道。 -pickshell- ♀ (0 bytes) () 04/10/2020 postreply 09:01:02
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