“如果你尝试着去改变你的自然的机体节律，我们不能完美的适应那样，”南希—克罗博士——埃默里临床睡眠混乱中心的主管说。

"If you're trying to alter your natural body rhythm, we don't adjust perfectly to that," said Dr. Nancy Collop, director of Emory Clinic Sleep Disorders Center.

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为了验证这种可能性，亚特兰大埃默里大学的爱米·波利克和弗朗斯·德瓦尔对一些黑猩猩和他们的近亲倭黑猩猩的手势和表情进行了研究。

To examine that possibility Amy Pollick and Frans de Waal, of Emory University in Atlanta, Georgia, have looked at gestures and expressions in chimpanzees and their cousins, bonobos .

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