真的沒必要那種頻繁的密集的群體測樣。本人住美國鄉下，至今沒有測過一次。

來源: FollowNature 於 2022-04-30 08:45:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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