N-VAR (聋哑人或使用不同语言的人交流时使用的)手语，手势语Sign language is movements of your hands and arms used to communicate. There are several official systems of sign language, used for example by deaf people. Movements are also sometimes invented by people when they want to communicate with someone who does not speak the same language. (聋哑人或使用不同语言的人交流时使用的)手语，手势语
Her son used sign language to tell her what happened.