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

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

But it's difficult, because you have to go there like four or five times a week.

但是要坚持学习真实太难了，你一周得去四、五次。

I used to实战 - SpeakingMax英语口语达人

But small farmers often have a difficult time getting their animals to market.

VOA: special.2010.08.03

However, for dietary intake, there have been fewer advances like that because it's such a difficult thing to get a hold of.

然而,对于饮食摄入量,和那些比则进步要少,因为这很难把握

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

They moved Eagle forward, away from a very rocky area that might have caused a difficult landing.

VOA: special.2009.07.15

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

But the published report says that would have forced it to fly in a difficult position.

VOA: special.2010.03.16

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

Students often have to take a difficult test to gain entrance to a special school.

VOA: special.2011.02.13

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

Professor Yoshino explains. "Shakespeare calls this a problem of ocular proof, the idea that we need to see evidence before we believe in it -- and that,oftentimes, when metaphysical questions of guilt or innocence are difficult for us to answer, we have a tendency to reduce them to questions that pertain to physical evidence.

VOA: special.2011.06.06

So we now have a situation that is much more difficult.

以至于现在的局势对于我们来说更加困难了。

普林斯顿公开课 - 国际座谈会课程节选

This can make it difficult to find funding. Many entrepreneurs have to deal with a lot of initial rejection.

VOA: standard.2010.01.31

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

The Dutch have won all four of their World Cup matches so far, and Brazil coach Dunga describes them as a very difficult opponent.

VOA: standard.2010.07.01

They are really a difficult concept to grasp when you have no base knowledge of it.

当你没有基础知识时，冠词确实很难掌握。

韩国人经常犯的失误 - SpeakingMax英语口语达人

"You might take this as a general principle, that if you have revolutionary transformations, it's extremely difficult to go back to legal,legitimized, constitutional transfers of power that revolutionary settlements, in fact,are quite dangerous as a precedent.

VOA: standard.2009.09.01

who, you know, have a very strong, difficult-to-understand accent, then they would say that

他们有很重的、难以听懂的口音，然后他们会说，

优雅的英式英语 - SpeakingMax英语口语达人

"We have just come through what was one of the most difficult decades the middle class has ever faced a decade in which median income fell, and our economy lost about as many jobs as it gained,".

VOA: standard.2010.01.25

But then also a little bit about your history, where you come from, some of your experiences which have helped you or informed your opinions on this very difficult issue that the entire world really is spending a lot of time trying to work on.

然后再谈谈你们各自的经历，你们从何而来，谈一些你们自己的经历,一些帮助过你们，或形成了你们,就这个复杂问题的观点,这个全世界都在投入大量时间试图解决的问题。

普林斯顿公开课 - 人性课程节选

She says it's no easy feat. "You have to kind of deliver so much of the story through your own written texts so it's difficult in that way because you have to get a character and a point across in 140 characters or less."

VOA: standard.2010.05.07

U.S.-Venezuelan relations since the populist Mr.Chavez was first elected in 1998 have been increasingly difficult, and he said in Moscow the new arms are to counter a U.S.-Colombian agreement last month under which U.S.forces will have access to several Colombian military bases.

VOA: standard.2009.09.15

Ugandan Minister of Defense, Crispus Kiyonga, said the African Union force, composed of 2,590 Ugandan troops and 1,600 from Burundi, has so far been able to defend the transitional government's state house, Mogadishu port and airport, but said reinforcements to al-Shabaab have created a difficult situation.

VOA: standard.2009.06.26