"We also owe it to every single one of them to ask the difficult questions about what we are doing in Afghanistan.

VOA: standard.2009.10.14

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

Who are they to us? We find it difficult to bewail their absence.

他们是谁？，我们发现很难为他们的离去悲叹。

耶鲁公开课 - 弥尔顿课程节选

and we are working with the settlement community to try to ease the pain involved because we know it is difficult for them,".

VOA: standard.2010.01.03

It's very difficult to be happy if we are experiencing severe depression or anxiety.

要快乐并不容易,如果我们感觉很压抑或焦虑。

哈佛公开课 - 幸福课课程节选

"This is at a time when we are working to relaunch negotiations and we believe that these actions make it more difficult for our efforts to succeed.

VOA: standard.2009.11.17

And this is no surprise if what we are is the workings of our physical brains, but it is extremely difficult to explain if one is a dualist.

如果我们的本质就是生理大脑的活动,那这也就没什么可惊奇的,但对于二元论者来说,解释这些却是非常困难的

耶鲁公开课 - 心理学导论课程节选

"As long as Gilad Shalit is there it is going to be very difficult for any Israeli government to suddenly say ok, we are going to change our policy.

VOA: standard.2010.06.10

None of these do we have vaccines for, and it's turned out that sexually transmitted diseases for a variety of reasons, we'll come back to later, are particularly difficult to develop vaccines for.

这些病我们都没有疫苗,已经证明,对于性传播疾病,有很多原因使得,我们稍后回来再讲,针对这类疾病的疫苗特别难做出来

耶鲁公开课 - 生物医学工程探索课程节选

The U.S.will need to put some pressure on India to make sure that India is helpful in every regard, because we are going to rely a lot on Pakistan to do a lot of heavy lifting and difficult work,"

VOA: standard.2009.12.06