But advisers say these can also be difficult sometimes for foreign students to get.

VOA: special.2009.05.28

And this is actually, in general, why it's sometimes difficult to teach or to tell stories because we constantly overestimate how much other people know.

概而论之，这就是为什么有时候我们很难能讲一个故事,因为我们总是认为别人什么都猜到了。

耶鲁公开课 - 心理学导论课程节选

I guess living with roommates can be very difficult sometimes.

有时候跟室友一起住不是很方便。

找房子的方法 - SpeakingMax英语口语达人

And my center of gravity is a little bit lower." "I feel like sometimes it is a little more difficult to knock me down.

VOA: standard.2010.02.09

The writer observes that survival is a difficult endeavor and that the world can sometimes seem harshly hostile.

作者发现，人类需要通过努力而生存,但这个世界往往是非常残酷的。

耶鲁公开课 - 旧约导论课程节选

Because sometimes they are difficult.

因为有时名字会很复杂。

I'm good at 实战 - SpeakingMax英语口语达人

It's a little difficult sometimes,

有时候我会觉得很困难，

教英语 - SpeakingMax英语口语达人