It would be difficult, even painful,to do so.

VOA: special.2009.12.06

So I will be really excited to do that, but that is very difficult to get.

如果能成功的话我真的很高兴，但是这个奖学金很难申请到。

耶鲁的著名人士 - SpeakingMax英语口语达人

The response to "Do you mind" question can be difficult.

对于“Do you mind”句型的回答可能有点复杂。

Do you mind 课堂 - SpeakingMax英语口语达人