Only in the past 20 years have specialists in language study realized that signed languages are unique—a speech of the hand.
直到最近20年，语言研究的专家们才认识到手语的独特性——一种用手表达的语言。
Like verb agreement in spoken languages, verb agreement in signed languages is a grammatical system, since it involves systematic encoding of syntactic and thematic roles.
和有声语言中动词呼应一样，手语中动词呼应也暗含句法角色和题元角色，因而它也应该被看作是一个语法系统。
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