And one reason we know this is because of the demonstrated case studies where a language is created within a single generation.

我们之所以这样认为,是因为有许多的个案研究,都证明了一代人之内是可以创造出语言的

耶鲁公开课 - 心理学导论课程节选

What happens is, in the course of a single generation, they develop their own language.

实际情况是,在一代人的时间里,他们创造出了属于自己的语言

耶鲁公开课 - 心理学导论课程节选