人体十大未解之谜:为何尴尬时会脸红?(图)(2)
2009-08-10 09:07:04
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为什么人会笑?
2.笑:当我们笑时,会释放改善情绪的安多酚,看似理所当然,但一个长达10年的研究发现,笑是由平庸的言论所引发多于笑话,令这个谜团更谜。
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