Because they cannot verbalize or fill out questionnaires, indirect techniques of naturalistic observation are used as the primary means of determining what infants can see, hear, feel, and so forth.

由于婴儿不能用语言表达或填写调查问卷，自然观察法的间接技巧被用来作为判断他们能看到、听到、感觉到什么等等的主要手段。

Watch out for how they verbalize with others.

注意他们是如何与他人交谈的。

Feelings are often very difficult for you to verbalize.

感情往往是你很难用语言表达。

He's a real genius but he has difficulty verbalizing his ideas.

他确实是个天才，可是难以用语言表达他的思想。

...his inability to verbalize his feelings.

他无法用言语表达自己的感情

I find it difficult to verbalize.

我感到很难用言语表达.

I cannot verbalize it in a concrete way. I am sometimes quite confused.

就是很多事情我是说不出一个具体的东西,有时候也挺迷惑的.

This depressed patient does not verbalize.

这位情绪低落的病人不爱说话.