亚特兰大市埃默里大学耶基斯国家灵长动物研究中心的弗兰斯·德瓦尔称，这强有力地证明了在进化史上，猿和人的笑声密切相关。

It gives strong evidence that ape and human laughter are related through evolution, said Frans DE Waal of the Yerkes National Primate Research Center at Emory University in Atlanta.

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在佐治亚州亚特兰大市埃默里大学研究灵长类动物社交行为的弗兰斯·德瓦尔说，信任有利于维持种群里面的社交和睦，这是人类早期生存下来的关键。

Frans de Waal, who studies primate socialbehavior at Emory University in Atlanta, Georgia, says the beliefhelps maintain social harmony within groups, a key to early humansurvival.

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弗兰斯·德·瓦尔在十月份出版的一本新书《移情时代》中得出几乎一样的结论。

Much the same conclusion is reached by Frans DE Waal in another book published in October, "the Age of Empathy."

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弗兰斯·德·瓦尔在十月份出版的一本新书《移情时代》中得出几乎一样的结论。

Much the same conclusion is reached by Frans DE Waal in another book published in October, "the Age of Empathy."

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