But the professor says it is difficult to find enough feathers from a single dinosaur to recreate all its colors.

VOA: special.2010.03.16

But a few verses later it's clear that the poet isn't really drowning: this is a metaphor for his difficult situation.

但是随后的几首诗证明了，诗人并没有真正的溺水：,这里的水象征着困境。

耶鲁公开课 - 旧约导论课程节选

So I think that it's true that the economy is difficult and there is big challenge in front of us.

所以我觉得，目前的经济形势真的很困难，我们面临着很大的挑战。

事业就是挑战 - SpeakingMax英语口语达人

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

VOA: special.2009.02.09

Whatever else it may be, everyone's always agreed that modern poetry is difficult. You will probably too.

不管是什么，每个人都会赞成,现代诗歌是艰深的，你或许也会认同这点。

耶鲁公开课 - 现代诗歌课程节选

For example, celiac disease is difficult to identify because the signs of the disease are so common.

VOA: special.2009.04.14

But before telling you about this let me sort of Go through some of the hypothesis that we have and That we are now testing about why the subject is Difficult and why these materials assembled what We have assembled them might be useful.

但是谈那之前我要说说,我们之前的一些假设,我们现在正在测试为什么这个学科很难,以及为什么我们整合这些资料是有用的,我们认为把它们整合起来或许有用。

麻省理工公开课 - 媒体、教育、市场课程节选

For example,celiac disease is difficult to identify because the signs of the disease are so common.

VOA: special.2010.06.15

And so part of the wilderness experience for me I think Mark Twain talks about wilderness and he says, I do it chiefly because it is difficult.

对于我来说，荒野的经验就像是,马克吐温在谈到荒野时所说，因为困难，所以我才去做。

普林斯顿公开课 - 人性课程节选

Sod can grow at times and in places where growing grass from seed is difficult.

VOA: special.2009.07.07

A little indirect but not so indirect that is difficult to understand. You should use this often.

有一点委婉，但不至于委婉到让人难以理解。应当尽量多使用这种句型。

Why don't 课堂 - SpeakingMax英语口语达人

But it is difficult to read and judge a wave when it is near.

VOA: special.2009.03.17

Why is it difficult in some cases to produce a vaccine when we've been successful in so many others?

为什么某些疾病的疫苗很难研制,即使我们已经成功生产了很多种疫苗

耶鲁公开课 - 生物医学工程探索课程节选

Confirming Mister Muse's true age is difficult because birth documents are rare in Somalia.

VOA: special.2009.04.25

Why don't we give Philip both the matching pair and give you each a pair of socks since he didn't get to wear this one, they are brand new, in fact, and a big round of applause for what I'm sure is a little difficult.

我们为什么不给飞利浦一双配对的袜子,给你们每人一双袜子,他还没穿这双袜子，所以这双还算是全新的，再次以热烈的掌声对他们表示感谢,这样的模仿还是有一些难度的。

哈佛公开课 - 计算机科学课程节选

If using your voice is difficult, then you know what dysphonia is.

VOA: special.2009.09.02

but he's also insisting that this is an incredibly difficult, if not impossible, moment of thought.

但他同时坚持，如果可能，这对思维来说也是一个极其艰难的时刻。

耶鲁公开课 - 文学理论导论课程节选

Even today, it is difficult to walk or ride through the park.

VOA: special.2009.04.15

There is a lot of research in psychology, a lot of evidence that shows how difficult change is.

心理学的研究有很多，很多证据显示，改变是非常困难的事。

哈佛公开课 - 幸福课课程节选

The F.A.O.says fish piracy is difficult especially for developing countries to fight.

VOA: special.2009.02.10

Ulysses is not difficult to read, and it richly rewards each reader in wisdom and pleasure.

尤利西斯》不难读，它会给每位读者以智慧和愉悦。

耶鲁公开课 - 1945年后的美国小说课程节选

So it is difficult to see the animals in the sand.

VOA: special.2010.01.04

This is actually a piece of code that is really easy to think about recursively and is much more difficult to think about in other ways.

这确实是一段用递归思考起来非常容易,而其它方法特别麻烦的代码,这一段代码的意思就是。

麻省理工公开课 - 计算机科学及编程导论课程节选

But it is difficult to put a price on troubled securities.

VOA: special.2009.01.30

There's also an important and, I think, a very real sense in which Milton wanted to make it seem and obviously this is a much more difficult feat wanted to make it seem as if the Nativity Ode were the first poem that anyone had written.

我还有一种强烈的感觉,弥尔顿想让人觉得,显然这很困难,想使《圣诞清晨歌》看上去像,任何一个人写的第一首诗。

耶鲁公开课 - 弥尔顿课程节选

It is difficult to tell exactly where the saying began.

VOA: special.2010.07.25

A boy who's bullied by his father may hate his father and want to hurt him but since this would--this is very shameful and difficult.

屈于父亲权威下的男孩,可能会憎恨他的父亲，想要伤害父亲,但这个想法是可耻的，也是难以实现的。

耶鲁公开课 - 心理学导论课程节选

DiCaprio admits that talking about the film is difficult because revealing too much could spoil surprises that await the audience.

VOA: standard.2010.02.27

Hobbes realizes this is a difficult and uphill task that he has set for himself.

霍布斯意识到他已经给自己,定下了一个困难而艰巨的任务。

耶鲁公开课 - 政治哲学导论课程节选

That is a very difficult time for people in the Internet industry.

对于互联网行业来说,那是一段困难时期。

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