# 到頭來發現,人類是高度善於社交的學習機器。我們生下來就是要學習、要建立關係、要玩耍。那麼,臉紅是唯一一種僅限於人類的表情,也就沒那麼奇怪了。畢竟,臉紅有著典型的社交性質──是人們在表達他們在乎別人怎麼想,而這種表達又促進了信任,並讓合作得以進行。——《人慈》
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