And he is praising four committees in Congress for agreeing on what he calls "a difficult and complex challenge."

VOA: standard.2009.08.08

We can never just have it there before us or, as I say, if we can--if we can--it's a very, very difficult act of concentration.

我们永远不能只面对着它，或者，要我来说，如果我们可以的话，那将需要高度集中注意力，这是很难的。

耶鲁公开课 - 文学理论导论课程节选

and she's now playing some pretty fairly difficult things considering that she has only taken for a couple of years. So,

尽管她才学了几年，她现在已经可以弹奏比较难的曲目了。所以，

和钢琴老师 - SpeakingMax英语口语达人

But for people who have a difficult time controlling their movements, this little navigational issue can be a really big problem.

VOA: special.2011.04.18

That's a quite difficult argument to pin down does it work or does it not work.

这个论证很难确定,是不是说得通。

耶鲁公开课 - 死亡课程节选

And if one person dies, the other person may have a difficult time claiming the couple's money or property.

VOA: special.2011.05.23

That means that for humans it can be a difficult and hostile place.

也就是说，它对于人类是个艰难且充满挑衅的地方。

耶鲁公开课 - 旧约导论课程节选

They created more than fifteen thousand paintings and sculptures designed to lift the spirits of Americans during a difficult time.

VOA: special.2009.03.23

It is in fact a very, very difficult and derivative act of the mind to try to forget that I am looking at a sign that says 'exit' and, in fact, just looking at what is there without knowing what it is.

事实上，试图忘记那个写着存在的标志,和只知道它存在而不知道它是什么，是非常难的事情。

耶鲁公开课 - 文学理论导论课程节选

But protecting plants and trees in the garden may not be too difficult if you follow a few suggestions.

VOA: special.2010.01.12

Finally this may be news to you, but this is not English 10A or Math 55, meaning you'll not have to read as much as you will read for 10A or for a history class, and this class is not as difficult as Math 55 so you rest.

最后这个可能对你们来说有些新，但这不是10A号英语课和55号数学课，也就是说你不用像10A号课或者历史课那样做大量的阅读，也不像55号数学课一样难，所以你们可以轻松些。

哈佛公开课 - 幸福课课程节选

Today,Frank Oliver and Doug Johnson tell about a special plane called Voyager and the effort to set a difficult world record.

VOA: special.2010.10.06

It shouldn't be difficult to see a kind of problem that is beginning to arise in Milton's text here.

这是一个很容易看出的问题,在弥尔顿的作品中也被提了出来。

耶鲁公开课 - 弥尔顿课程节选

Today,the solution to the problem is so common that it is difficult to understand that there was a problem at all.

VOA: special.2010.07.14

And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The parents find a way to pay for their endless medical expenses that requires them to make a very difficult moral decision.

VOA: special.2009.10.12

It is a little bit difficult in the sense that to have gotten into Princeton, one almost certainly has had to know something about something. Right?

之所以比较困难是因为,一个人如果想要进入普林斯顿大学，他一定,对某个领域有一定了解？

普林斯顿公开课 - 人性课程节选

And I feel like having dealt with adversity really helps me to lead a group of men through difficult times as well."

VOA: special.2010.06.02

For most people, that's a difficult concept and-- I think I may have mentioned some of this before, but let me give this history.

这个概念对大多数人来说有些难,我记得我之前提及过其中一些,但还是让我来讲述一下它的历史

耶鲁公开课 - 金融市场课程节选

But they say finding injured birds in the huge spill and sending out boats to rescue them will be a difficult job.

VOA: special.2010.05.04

Instead, what's difficult in Crane is a kind of compression in his writing.

实际上，克莱恩的诗难读的原因,是在于他的作品中过分简要的阐述。

耶鲁公开课 - 现代诗歌课程节选

The objects in the exhibit tell a story about government expansion during a difficult period in American history.

VOA: special.2009.01.02

Internet industry was in a very difficult time at that time, at that period, and we gradually realized that this company cannot really survive if we stick with the backend technology providers thing.

当时互联网行业正处于困境，如果坚持做后台搜索技术提供商,这个公司将无法生存。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

It expresses the movie's difficult love story between a young woman and a vampire and the battle they must prepare to fight.

VOA: special.2010.06.25

You can train it to flap its wings to escape a situation but it's very difficult to get it to flap its wings for food.

你可以训练鸽子,通过扇动翅膀来脱离某个情境,但却很难通过训练鸽子扇动翅膀来进食。

耶鲁公开课 - 心理学导论课程节选

It tells about her accident and how it taught her a very difficult lesson about life and chance.

VOA: special.2009.10.30

See you Friday. We'll finish on calorimetry and thermochemistry and then we'll start in on one of the really most difficult topics that we'll deal with all semester, which is a second law and our special function that

好，我们周五见,我们会讲完量热法,和热化学的内容，然后我们会开始,讲这个学期最难的话题之一,第二定律以及我们

麻省理工公开课 - 热力学与动力学课程节选

But he said he found it difficult to perform because Porgy has a bad leg and cannot walk.

VOA: special.2010.03.07

But before we dismiss Aristotle's account as insufferably inegalitarian and elitist, we have to ask a difficult question, not just of Aristotle, but more importantly of ourselves.

但在我们驳斥亚里士多德的论点之前,即令人无法忍受的不平等及精英者论点，我们必需要问一个艰难的问题，不只是关于亚里士多德，对我们更是重要。

耶鲁公开课 - 政治哲学导论课程节选

Why is this a more difficult game to attain coordination in?

为什么这个博弈更难协调

耶鲁公开课 - 博弈论课程节选