san marino 才三萬人口，意大利國土內的小國，這個例子沒有說服力。群體免疫要達到60%，路漫漫。。。

來源: 貞德於 2020-08-01 14:24:25 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.