This finding bolsters the so-called gestural theory of language evolution, whose proponents argue that language evolved initially as a gesture system before becoming vocal.
这个发现奠定了语言进化中所谓的手势理论。 这个理论的拥护者主张，语言在成为一种发声的表达方式之前是由手势表达系统演化而来的。
A delay in or total lack of the development of spoken language (not accompanied by an attempt to compensate through alternative modes of communication such as gesture or mime).
口语能力发育滞后或完全缺失，且未有寻求诸如手势或肢体语言等替代手段的表现。
Apart from sign language we can communicate with them by lip readings or other means such as body language gesture facial expression writing and drawing.
除了手语之外，我们可以透过唇读口语，或者身体语言、手势、表情、书写文字或图画，与失听人士沟通。
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