sign language
柯林斯词典
1. N-VAR 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. 手勢語
Her son used sign language to tell her what happened. 她的兒子用手勢語告訴她發生的事情。
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