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

He says that it is difficult to make the distinction.

他说很难区分。

耶鲁公开课 - 文学理论导论课程节选

it's very difficult when one is so articulate and is able to express exactly what you want to say,

当一个人已经熟谙一门语言，能够用这门语言清楚明白地表达意思，

想学好英语吗？ - 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

But I want you guys to think about why it was difficult to do it another way, which is more pedestrian.

但是我希望你们能思考一下,为什么用另一种更普遍的方法来做,反而会比较难呢

耶鲁公开课 - 基础物理课程节选

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

VOA: special.2009.04.15

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

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

VOA: special.2010.01.04

I worked on specifically, I looked at -and this is also the reason why it's difficult to say what is a just university, because we didn't just look at Princeton, we didn't just look at Ivy League Schools or at least private institutions.

我专门研究的是,顺便，这也是为什么,为公正的大学下定义很难得原因，因为我们研究的不仅仅是普林斯顿大学，也不仅仅是常青藤学校,至少不是私人学校。

普林斯顿公开课 - 人性课程节选

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

VOA: special.2009.01.30

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

It is difficult to tell exactly where the saying began.

VOA: special.2010.07.25

Now this isn't the first time in this course that I've paused over a moment at a crossroads where you can't possibly take both paths but where it is obviously very, very difficult to make up one's mind.

现在是这个课程中第一次,在一个分叉路口停下,我们不可能同时走两条路,但是这也显然是非常难以决定的一个地方。

耶鲁公开课 - 文学理论导论课程节选

So when you talk to class four, he says,then it is difficult to teach the little kids in class one.

VOA: standard.2010.02.25

And I do that very precisely because it'll teach you a little bit about how easy or difficult it is to do it and what kind of information you retrieve from a dietary assessment.

我这样要求是因为,这能教给你,做评估的难易程度,以及你们能从饮食评估中得到何种信息

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

There is this audit and recount process. It is difficult to put a timeline to both of these activities at this point."

VOA: standard.2009.09.15

So if you're trying to make a more complicated organic molecule carbon-carbon bonds are one of the most difficult things to make in organic chemistry, and it turns out that c n minus is a very reactive molecule, so it's a good way, even though we'll go over some drawbacks in a second, it is a good way to make carbon-carbon bonds.

如果你要合成一个更复杂的有机分子,碳碳键是有机化学中,最难制造的键之一，而实际上氰离子是一种具有很高活性的分子，用它是一个好办法，尽管我们一会儿将看到它的一些缺点，但它的确是一个制造碳碳键的好方法。

麻省理工公开课 - 化学原理课程节选

"I think one needs to recognize given the current state of relations it is difficult to describe it as a strategic one anymore.

VOA: standard.2009.10.27

Now the question is "how does it expand" and "why is it so difficult for us to understand, accept, assimilate and live according to the fact that we can make a difference, if we understand that what we need to understand is how change happens.

问题是“它如何扩大“,以及为什么我们难以理解，我们能够做出改变这个事实,并接受，被同化以及据此生活，如果我们能了解我们需要理解的,是改变如何发生。

哈佛公开课 - 幸福课课程节选

He says it is difficult to know how the disease will evolve.

VOA: standard.2009.05.14

But,it's hard,if you're fourty-seven years, your job is a pretender to the throne, it's difficult.He had a hard time getting around.

但是,如果你要花四十七年,去争夺王位,是很不容易的,他做得很艰苦

耶鲁公开课 - 1871年后的法国课程节选

"Because there are only a couple of previous records of eruption at this particular volcano, it is difficult to judge either how long the activity will go on there, or how long the volcano might then be dormant before it goes active again."

VOA: standard.2010.04.15

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

However,this is more difficult because it is harder to control the diets of people and because they live longer than other animals.

VOA: special.2009.09.01

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 was not difficult to agree between us that neither party is in favor of handing any more powers to the European Union."

VOA: special.2010.05.14

There was a conditional agreement: yes, Norway should manage this oil risk but it's politically difficult and that's the problem-- is that we're not able to do our optimal management.

他们在一定程度上同意我的观点：,是的，挪威应该设法解决石油的风险,但这在政治上很困难,其问题在于-,挪威无法做到最优的管理。

耶鲁公开课 - 金融市场课程节选

Yet many people today cannot see the Maze District because it is so difficult to reach.

VOA: special.2009.04.15

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

I'm able to move around, but it is very difficult.

我可以跳槽，但很难。

美国的失业情况 - SpeakingMax英语口语达人