Why, then, should we not study the acquisition of a cognitive structure like language more or less as we study some complex bodily organ?

我们为什么不应当,像研究某些复杂身体器官那样,去或多或少地研究,像语言这样的认知结构的习得

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