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

There seems to be no interesting difference between how the brain comes to acquire and use the spoken language versus a sign language.

似乎大脑在如何获得和使用口语语言,与如何获得和使用手语之间,不存在任何的差别

耶鲁公开课 - 心理学导论课程节选

It's not a full-blown language like american sign-language or langue des signes quebecoise but it's a language nonetheless, with words and syntax and phonology.

这种语言并不像美国手语,或加拿大魁北克手语那样成熟,尽管如此,这种语言依然拥有词,语法和语音

耶鲁公开课 - 心理学导论课程节选

That sign languages may be full-blown languages but they just take--they're just harder to learn because the brain and the body have adapted for speech.

手语或许是成熟的语言,但它们更难学,因为大脑和身体已经适应了口语

耶鲁公开课 - 心理学导论课程节选

So, what I want to do is, I want to discuss the scientific notion of language, at first restricting myself to systems like English and Dutch and American sign language and Navajo and so on.

因此,我想做的是,我想来谈谈语言的科学定义,首先我会将自己限定在,诸如英语,荷兰语,美国手语,或迪瓦霍语等语言系统之下

耶鲁公开课 - 心理学导论课程节选