‘Buh’ could also have been used to communicate, says Bart de Boer, an expert on the evolution of speech.
“祖先们也用‘Buh’交流”，言语进化专家Bart de Boer说道。
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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.