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Scientists have long been interested how the deaf process signed languages in the brain.

科学家们长期以来一直关注聋哑人的大脑是如何处理手语的。

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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。

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Contrary to popular belief, most interpreters (who work with spoken or signed languages) do not work at the United Nations.

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

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Before his remarks, President Obama signed an executive order to expand educational opportunities for First American students aimed helping to preserve Native languages, cultures, and histories, while ensuring that these young people are prepared for colleges and careers.

WHITEHOUSE: President Obama at the Tribal Nations Conference