John's slight speech impediment made it difficult for his mother to understand him.

约翰轻微的口吃使他母亲难以听懂他。

《柯林斯英汉双解大词典》

Being a child, I was unable to understand him.

作为一个孩子，我无法理解他。

youdao

I wanted to climb to understand him.

我想爬上去了解他。

youdao

It was hard for him to fully understand what he saw in her expression.

VOA: special.2009.09.05

We had to be taught how to read him, how to understand him.

我们得通过学习才能理解他的作品。

耶鲁公开课 - 公正课程节选

Because just the act of explaining it to him or her has helped me understand it.

然后再把它们送走,因为给它们解释的这个过程。

麻省理工公开课 - 计算机科学及编程导论课程节选

His speech is so slurred that it's difficult to understand him.

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Unable to understand him, his ex-wife who was caring for him at the time gave Tommy a pen and paper and asked him to write down what he meant.

BBC: NEWS | Health | Creative side unlocked by stroke

Mr. RICHARD LAND (Southern Baptist Convention): Clearly, he is opening the door there for evangelicals to understand him as saying I'm not claiming to be a Christian the way you believe in Christ.

NPR: Romney Seeks to Put the Mormon Question to Rest