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Some sign languages are very sophisticated means of communication.

一些手势语是非常复杂的交流方式。

《柯林斯英汉双解大词典》

Sign languages vary from country to country,and many are not well known internationally.

VOA: standard.2009.09.10

It turns out that sign and--the developmental milestones of sign languages and the developmental milestones of spoken languages are precisely the same.

手语的发展阶段,和口语语言的发展阶段是完全相同的

耶鲁公开课 - 心理学导论课程节选

I'm going to put aside for the moment the question of sign languages and how they work.

我想暂时把手语,及其如何作用的问题先放到一边

耶鲁公开课 - 心理学导论课程节选

This had referred to the rights of speakers of all minority languages including sign languages.

BBC: Irish language strategy continued

"Sign languages ... evolve in a community of users, and are not signed versions of spoken languages, " the university said in a press release.

CNN: Researchers document distinctive Hawaii Sign Language

Reading and writing problems appear to develop in deaf people because sign languages are not phonemic in the sense that a spoken language is.

ECONOMIST: The cat sat on the tam | The