Scientists have searched for the origins of human speech in the hoots, grunts, and other vocalizations made by primates. It would seem to make sense, after all, that such sounds may be related to the more varied and articulated sounds we humans make. But there are significant differences.科学家一直在通过研究灵长类动物发出的鸣响声、呼噜声以及其他发音来探寻人类语言的起源.这似乎很有道理,毕竟这些声音与人类发出的更加多变、更加清晰的声音有相似之处.其实,两者之间还是有很大不同的. For example, human speech is learned, made using controlled and rapid movements of the tongue, lips, and jaw.比如,人类语言是后天习得的,人类通过控制舌头、嘴唇和下颚间的快速运动来发声._____________________________.