Somehow, when I told you to invert the transformation, some of you had some difficulty.

我上次让你们逆推变换公式的时候,有的同学觉得很困难

耶鲁公开课 - 基础物理课程节选

Sometimes when I am traveling in America, people have a difficulty understanding me.

有时候，当我在美国旅游的时候，人们要理解我，会有一点困难。

有趣的澳大利亚英语 - SpeakingMax英语口语达人

But now that means there is a serious danger here, and in Genesis 3:22, God says, "Now that man has become like one of us, knowing good and evil , what if he should stretch out his hand and take also from the tree of life and eat, and live forever?"

但在那个时候，意味着，他们将面临很大的困难，《创世纪》第3章第22节，上帝说，现在那个人已经变得与我们相似，能知善恶,现在恐怕他又伸手摘生命树的果子,从此以后长生不老“

耶鲁公开课 - 旧约导论课程节选

The other is that some places where the disease occurs the governments are not stable, or there might be civil unrest or civil wars and that makes it very difficult to orchestrate giving vaccines when there's other things happening in the country that are of more immediate concern.

另一个原因是,一些疾病发生地区,当地的政局不那么稳定,或者有动乱和内战,当在一个国家内发生许多,突发应急事件的时候,疫苗的分派发放会变得非常困难

耶鲁公开课 - 生物医学工程探索课程节选

It was kind of harder back when it was film and everything

以前用胶卷的时候就困难一些了

喜欢的照片 - SpeakingMax英语口语达人

Have you run into any difficulty while learning a foreign language?

学外语的时候你遇到过什么困难吗？

阳光总在风雨后 - SpeakingMax英语口语达人

What do you do when you get stuck writing essays?

当你写论文的时候遇到困难，要怎么做？

关于学校生活 - SpeakingMax英语口语达人

It's, because sometimes it's generally tough at first,

学习语言最一开始的时候总会很困难，

想学会4种语言 - SpeakingMax英语口语达人