瞎猜一個原因。國內人多，也沒那麽幹淨，免疫係統總處於和微生物的對抗中，變得很皮實。就像手常用，會生老繭，能幹粗活。

來源: 湖西於 2024-01-07 16:13:55 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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