As far back as Charles Darwin, scientists have noted that apes make characteristic sounds during play or while being tickled, apparently to signal that theyre interested in playing.
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- 早在查尔斯?达尔文时期,科学家就已经注意到,在玩耍或者被瘙痒后,猿类会发出特别的笑声,这似乎表明它们很喜欢玩耍。