1. True language—the spoken languages used by most people and the gestural languages used by the deaf—does not have to be taught in special classes. 真正的语言-----大多数人所使用的口头表达，耳聋者所使用的手语是无须通过特定的课程教授的。
2. Sign language is a visual/gestural language that serves as the primary means of communication for deaf individuals, just as spoken languages are used among the hearing. 手语是听语障者主要之语言沟通方式，也可以说手语是他们所使用的母语。
3. 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. 这项发现支持了语言演化的肢体理论，提倡这理论的人认为语言最初是从动作系统开始，后来才发展出语音系统。
