the brain wasn't relevant to our study of language大脑和人类的语言学习能力并无关联

relevant to与 ... 有关

These facts are relevant to the case.

这些事实和此案有关。

The essay isn't even remotely relevant to the topic.

这篇文章毫不切题。

so that was the sort of general level at which it was understood.当时人们的理解差不多就在这个水平上

the sort of那种

He's the sort of person I really dislike.

他这种人我真不喜欢。

It was the sort of night when phantoms might walk.

这种夜晚正是幽灵出没的时候。

it's become apparent just how complicated the brain functions involved in language really are.大脑对语言作用的复杂性日益凸显

involve in卷入； 陷入

I don't want to involve in this matter.

我不想牵扯到这件事里面去。

I got involved in a quarrel about the price.

我被卷入了一场有关价格的争吵。