There is this social context of race relations whose grammar he is also learning, and I would just remind you of the passage where he starts to ask his mother about whether his granny is white or not.

一种来自家庭无可绘状的影响,当时社会的种族对立，对他学习的语言也有很深的影响,各位看一下当他问母亲,祖母是白人还是黑人？

耶鲁公开课 - 1945年后的美国小说课程节选

But the cases of specific language impairments suggest that all of that is wrong, because there are children in this world right now who are plenty smart, who really want to communicate, and who are entirely social creatures but they can't learn language.

但是特殊言语损伤的案例表明,以上的所有都是错的,因为现在在世界上,会有些足够聪明,想要交流,完全社会生物的儿童,他们无法学习语言

耶鲁公开课 - 心理学导论课程节选