But for many of the world's poor, finding a good way to keep food cool is difficult.

VOA: special.2009.02.09

It also is a good lesson in how difficult it is, and we'll talk about this in a subsequent class, to actually measure what people eat.

同样这能很好的说明,实际评价人们的饮食有多困难,我们下节课会讨论这个话题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

That's a very difficult challenge in the Senate right now. It's not looking very good these days,

目前这在参议院是很大的挑战。现今的形势看上去不容乐观。

对全球变暖的政策 - SpeakingMax英语口语达人

Even a man with a good job had a difficult time feeding his family.

VOA: special.2009.10.29

This makes it difficult you could say and this is Aristotle's point I think this makes it difficult for the philosopher to be a good citizen of any actual regime.

可以这么说，这让它变得很难搞,而这也是亚里士多德的重点,我认为这让哲学家很难成为好公民,无论身处那一种现行政体中。

耶鲁公开课 - 政治哲学导论课程节选

And it was difficult. Mainly that was because few good roads for driving existed.

VOA: special.2010.01.11

So, if you smile at somebody, and you just hate their guts but you want to smile at them, it's--unless you're quite gifted it's difficult to fake a really good, really happy smile.

所以，你对某人微笑，你很讨厌他们，但你要对他们微笑，除非你很有天赋,很难去假笑，伪装真正的微笑。

耶鲁公开课 - 心理学导论课程节选

The most difficult part,she says, is creating a good design.

VOA: special.2009.05.18

Imagine how much power it takes to drive an artificial heart, so you've got to have a battery or some way of generating power continuously to operate that and that makes it difficult to think about implantable and so that's a really good example of Biomedical Engineering.

驱动人工心脏所需要的能量是难以想像的,所以需要电池或者是某种持续发电装置,来给人工心脏提供能量,这就增加了人工心脏的植入难度,这是很好的生物医学工程的例子

耶鲁公开课 - 生物医学工程探索课程节选

General Allyn says U.N.and Haitian forces continue to have lead responsibility for security, which he says has been mostly good in very difficult circumstances.

VOA: standard.2010.01.19

And,these are occurring at a time when the global economic crisis is making it more difficult to maintain good health, especially in the developing world.

VOA: standard.2009.05.18