The researchers point out that gene flow between crops and their wild relatives is common and difficult to contain.

VOA: special.2009.10.27

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

Because there are no articles in the Korean language, so that makes it really difficult to learn them in English.

因为韩语里面没有冠词一说，所以对他们来讲学习英语冠词真的很难。

韩国人经常犯的失误 - SpeakingMax英语口语达人

In Washington, Julianne Brienza notes that next year it will be more difficult to get donations for Capital Fringe.

VOA: special.2009.08.05

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

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

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

He said later that he did so because he was finding it difficult to bring up the question of surrender.

VOA: special.2009.12.24

There may be circumstances under which it's the case but it's often difficult to control.

可能在某些环境下可以做到,但是通常情况下很难控制。

麻省理工公开课 - 热力学与动力学课程节选

An extremely low body temperature can cause the heart to beat so slowly that a pulse may be difficult to find.

VOA: special.2009.12.30

And because you can't really know, it's difficult to make the right kinds of plans.

又因为你无法知道，要作正确的规划就困难重重。

耶鲁公开课 - 死亡课程节选

He says the actively changing nature of the Internet makes it difficult to stay current in studying its effects.

VOA: special.2010.01.28

They find it very difficult to grasp the world as another person might see it.

他们很难从他人的角度出发来认识世界

耶鲁公开课 - 心理学导论课程节选

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

Let's make the red light the symbol of 'go.'" And now with the ecological movement it would be very difficult to make the green light the symbol of "stop," and in any case all sorts of complications would arise. Right?

我们来假设，红灯的意思是出发“,那么难道,绿灯的意思是停止吗？,这样会引起各种不必要的麻烦？

耶鲁公开课 - 文学理论导论课程节选

Doctor Cawkwell told VOA that fibromyalgia is a very mysterious disease that has proved difficult to diagnose and treat.

VOA: special.2011.08.02

I want to illustrate one of the reasons why it has been so difficult to get a grasp on the hair cells in the inner ear.

我想用图例为大家说明一下,为什么难以捕获内耳中的毛细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

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

VOA: special.2010.03.07

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

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

VOA: special.2009.04.14

It's gone down a path towards maturation that's very difficult to go back up.

它在分化成熟的道路上越走越远,覆水难收了

耶鲁公开课 - 生物医学工程探索课程节选

And Howard Russell, an insect expert at Michigan State University, says once they get to the marching point, they are difficult to stop.

VOA: special.2009.01.27

Accent is something somewhat difficult to define and categorize.

重音是很难定义和分辨的。

耶鲁公开课 - 现代诗歌课程节选

The country had suffered a serious economic depression the year before, and jobs were difficult to find.

VOA: special.2009.05.28

some foods are pretty difficult to deconstruct if they're concoctions of foods.

有些食物很难解构,如果是混合食物

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And even if I had enough money, I knew that such diamonds are very difficult to find.

VOA: special.2009.07.18

So while the relationship of D to some of the laws in the Covenant Code is often--not always but often--one of revision, the relationship between D and the laws in the Priestly source is more difficult to characterize.

那么，尽管申命记材料和契约法典中的律法的关系,往往是，不是总是而是往往，是修订，申命记材料中的,律法和祭祀派材料的的关系则更难定义。

耶鲁公开课 - 旧约导论课程节选

"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

or places miles away, maybe in Timbuktu or whatever, who find it difficult to get educational materials from the local university or whatever, can watch certain lectures from Yale on the web.

或者更遥远的国度,像廷巴克图,他们可能在当地大学,不容易得到这样的教育资源,他们就可以到耶鲁网站观看这些视频

耶鲁公开课 - 博弈论课程节选

Oh really? I imagine that it must be very difficult to drive in a big city like New York.

是吗？在大城市开车肯定会比较困难，比如在纽约。

Do you ever实战 - SpeakingMax英语口语达人