"The ambiguity that's in those answers is very,very difficult for humans to understand, never mind a computer to understand.

VOA: special.2011.02.28

He says,"There are many things in Paul's letters very difficult to understand. And some people twist them to their own destruction as they do other kinds of scripture."

他说“保罗的书信里有很多,难以理解之处，而有些人曲解它们,这是自取沉沦，正如他们对待其他圣典一样“

耶鲁公开课 - 新约课程节选

A little indirect but not so indirect that is difficult to understand. You should use this often.

有一点委婉，但不至于委婉到让人难以理解。应当尽量多使用这种句型。

Why don't 课堂 - SpeakingMax英语口语达人

So,just being able to pick one of those up will help our visitors understand how difficult portability was about thirty years ago."

VOA: special.2011.02.15

But it's difficult to understand what the impact was, and the poisoning of the political atmosphere.

但是很难理解这有什么影响,对政治气氛有什么毒害

耶鲁公开课 - 1871年后的法国课程节选

It was difficult for her to understand why she had married.

VOA: special.2009.06.27

and that's often very difficult to understand, just like Birmingham as well.

非常难懂，这也像伯明翰一样。

方言口音很重 - SpeakingMax英语口语达人

He hoped he had made the country understand one thing: the great need to forget hatred and bitterness in the difficult time of re-building that would follow the war.

VOA: special.2009.12.31

It's a very complicated situation because the kind of economic risks that we face are difficult for most people to understand.

一个很复杂的情况是,我们所面临的经济风险,很难被大众完全理解。

耶鲁公开课 - 金融市场课程节选

Now the question is "how does it expand" and "why is it so difficult for us to understand, accept, assimilate and live according to the fact that we can make a difference, if we understand that what we need to understand is how change happens.

问题是“它如何扩大“,以及为什么我们难以理解，我们能够做出改变这个事实,并接受，被同化以及据此生活，如果我们能了解我们需要理解的,是改变如何发生。

哈佛公开课 - 幸福课课程节选

who, you know, have a very strong, difficult-to-understand accent, then they would say that

他们有很重的、难以听懂的口音，然后他们会说，

优雅的英式英语 - SpeakingMax英语口语达人