你的泪目，你的笑颜。

Human laughs, cries, and scowls are evolutionary remnants of an ancient and more primitive system for communication, a system from which ape hoots and gestures emerge. However, when we speak words, we are doing something without any clear analog to any system of ape communication.
人类的欢笑、哭泣和皱眉是古老而原始的交流系统的进化残余，这种系统产生了猿类的啸叫和手势。然而，当我们说话时，我们正在做一些与猿类交流系统没有明显相似之处的事情。
Figure 20.3
Original art by Rebecca Gelernter