The rising power of a militant group called al-Shabab in neighboring Somalia has also added a new security challenge in the region.

VOA: standard.2009.05.01

I think there is the essence of personal challenge in dealing with that.

我想关于这个问题,个人面对的挑战是关键。

普林斯顿公开课 - 人性课程节选

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

The winner will face a tough challenge in the general election against long-time liberal Democratic Senator Barbara Boxer.

VOA: standard.2010.06.08

That's a very difficult challenge in the Senate right now. It's not looking very good these days,

目前这在参议院是很大的挑战。现今的形势看上去不容乐观。

对全球变暖的政策 - SpeakingMax英语口语达人

But,he says,ease of mobility still is a frequent challenge in his low-income Bronx neighborhood.

VOA: standard.2010.07.27

Realize that there's an inevitably challenge for us and actually helping people in this kind of context, especially as the deadline really approaches.

这对我们来说是一个不可避免的挑战,需要在这种环境下帮助人们，特别是当最后期限要接近了。

哈佛公开课 - 计算机科学课程节选

Next month,the former Alaska governor heads to Arizona to campaign for her former running mate, Senator John McCain, who faces a challenge in the Republican primary from former Representative J.D.Hayworth.

VOA: standard.2010.02.09

- Part of the challenge is speed, too, how quickly you can get these answers in terms of getting them in on time.

部分困难也会来自于速度，你多快能做出答案,能否在规定的时间做完。

麻省理工公开课 - 化学原理课程节选

The American Le Mans Series became the first racing event to use the protocols in its Green Challenge competition.

VOA: special.2009.11.03

There are not many countries in which, for instance, ; that sort of religious challenge, say, to science; it happens more frequently in this country.

比如说，很少由国家，那里宗教对科学造成的威胁;,比美国还要频繁。

普林斯顿公开课 - 人性课程节选

Ten children ages eight to fourteen were in New York recently for the finals of this year's Discovery/3M Young Scientist Challenge.

VOA: special.2009.10.15

In these parts of the Politics Aristotle offers a serious challenge to existing Greek traditions and patterns of political education.

在这部份的《政治学》,亚里士多德对,当时的希腊政治教育传统与模式,提出严肃的挑战。

耶鲁公开课 - 政治哲学导论课程节选

He says the biggest challenge is jobs the disabled have the lowest employment rate of any minority group in the country.

VOA: special.2009.08.15

So in retrospect, I think the way to deal with crisis, deal with challenge, deal with difficult times, is like this: First, you need to be realistic.

回首去年，我们应对危机，面对挑战时，所采取的方法就是：,首先，要变得现实一些。

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

And that is a major challenge." Larry Graham,president of the National Confectioners Association in Washington, represented industry groups at the launch of the framework.

VOA: special.2010.10.26

The challenge is greater because in 2001 we had a fairly easy victory over the Taliban.

说挑战大,那是因为2001年在与塔利班的较量中，我们轻松地获胜。

普林斯顿公开课 - 国际座谈会课程节选

A challenge that affects parents, children and citizens in almost every community in America should not be a Democratic problem or a Republican problem.

VOA: special.2010.08.12

Our first area of challenge is in access.

我们第一个挑战在接触上。

麻省理工公开课 - 媒体、教育、市场课程节选

"This has clearly been a systemic challenge for financial stability in the euro area.

VOA: special.2010.05.14

It's a challenge, and Eikhenbaum's essay that you read for today is in part--to a degree that it can't really come out and talk about, or doesn't want to come out and talk about it a response to Trotsky's book.

而艾肯鲍姆在论文中,却并没有回应托洛斯基的书，艾肯鲍姆并不想回应,不愿站出来回答。

耶鲁公开课 - 文学理论导论课程节选

Palin recently campaigned in Texas, where Republican Governor Rick Perry faces a primary challenge from Senator Kay Bailey Hutchison.

VOA: standard.2010.02.09

What it meant was that in principle, your power was greater than any challenge that could come from those underlings, those craven reptiles in your imagination over whom you ruled.

这意味着在原则上,你的权利大到,不会受到属下的任何质疑,在你的眼里他们应该是低声下气的应声虫

耶鲁公开课 - 欧洲文明课程节选

But Waziristan, just south of the valley in the Federally Administered Tribal Areas, presents a very different challenge for the military.

VOA: standard.2009.06.18

Reason, although it was employed for all sorts of practical and intellectual purposes in some of these cultures, it still lacked independence from religion and it lacked the high status to challenge the most basic received ideas.

尽管在这些文化中,理性在只是理论上,实际活动中都有被利用,但是它始终无法与宗教割裂,地位也很低,而不被大多数人接受

耶鲁公开课 - 古希腊历史简介课程节选

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

VOA: standard.2009.08.08

Now that's not a very realistic assumption and we are going to come back and challenge it at the end of semester, but this will be complicated enough to give us a lot of material in the next ten weeks.

这不是一个很符合实际的假设,在期末的时候我们再来推翻这个假设,但是就这个假设下的内容,就足够我们接下来的十个星期学的了

耶鲁公开课 - 博弈论课程节选

Working in so many different genres, Williams says his daily challenge is coming up with the right sound for a show,movie,or album.

VOA: standard.2010.07.20

That might be a good way to do it but it's going to be more of a challenge because you might - you're going to have a lot of these non-coding sequences that are in the way.

这或许是个好方法,但这会带来更大的问题,因为也许--,会有许多不编码蛋白质的序列,干扰你的筛选

耶鲁公开课 - 生物医学工程探索课程节选

And then we hand you 140,000 English words in the form of a big text file much like our aspiring pre-med students in recent months, and we challenge you to implement the fastest spellchecker possible.

然后我给你一个包含1万4千单词的超大文本,就跟前段时间那位,有抱负的医学预科班的学生一样,我想让你在最短时间内实现拼音检查。

哈佛公开课 - 计算机科学课程节选