visible speech

visible-speech的词性：
n.（名词）

1. A system of phonetic notation used as an aid for teaching speech to hearing-impaired people and consisting of diagrams of the organs of speech in the various positions required to articulate sounds.
可见语言：帮助给听力受损的人进行语言教学所用的一种语音符号系统，由发音器官在要求发音时的各种位置的图解构成