What do you think is the most difficult part about studying English in the UK?

你觉得在英国，学习英语最难的部分是什么？

巴西的英语老师 - SpeakingMax英语口语达人

You've read all of one essay and you've read part of another, "Differance," and you've found him very difficult.

一整篇论文和另一篇论文的一部分，《延异》，大家已经发现了，德里达的作品很难懂。

耶鲁公开课 - 文学理论导论课程节选

Part of the problem with using operant conditioning with babies is it's difficult to get them to behave in any systematic way.

应用操作性条件作用的部分问题在于,很难使婴儿们按照系统的方式行动

耶鲁公开课 - 心理学导论课程节选

I want to say a little bit about the cost of vaccines because this is a part of what makes it difficult to accomplish what's usually our goal in a vaccine development, which is deliver the vaccine to every population in the world.

我想谈谈关于疫苗的成本,因为这是令我们的疫苗发展目标,无法得以实现的困难之一,这个目标就是将疫苗送至世界上每一个人

耶鲁公开课 - 生物医学工程探索课程节选