I am not going to walk away from the American people. I am not going to walk away on this challenge.

VOA: standard.2010.02.06

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

And so if you choose to elect the hacker edition of this week's problem set the challenge will be to figure out not only how to implement the game but how to implement a solver for the game.

因此，如果你选择这周的应用题目为升级版,那么你将面临的挑战,不仅是如何实现这个游戏，而且,要实现此游戏的解决方法。

哈佛公开课 - 计算机科学课程节选

I am not going to walk away from any challenge. We are moving forward."

VOA: standard.2010.02.06

And for me it's fun because I may not know the novel that you end up picking, and so it is a kind of challenge for me to take a novel that you've chosen and come to grips with it myself It may be one that I know.

我也觉得很好玩,因为我可能不知道你们最后选择的小说，所以对我来说,认真对待你们选的一本书很有挑战性,可能是一本我知道的书。

耶鲁公开课 - 1945年后的美国小说课程节选

"The challenge now is to continue to show this clear and convening leadership, while not losing sight of your ongoing work to secure the security, prosperity and dignity of our fellow human beings."

VOA: standard.2010.07.06

For you or for me, it is not a challenge to walk around these cubes, or the audience or somebody from different points of view and recognize that they are really the same person.

对于我们这样的人，换个角度绕场行走，围着某个观众或者其他人去走,会认识到他们是同一个人。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

The ruling by Ukraine's Central Election Commission to not investigate allegations of vote rigging is a setback for pro-Western Prime Minister Yulia Tymoshenko's campaign to challenge the results of the February 7 ballot.

VOA: standard.2010.02.14

The Athenians refuse to tolerate Socrates because they know he is not harmless, that he poses a challenge, a fundamental challenge to their way of life and all that they hold to be noble and worthwhile.

雅典人拒绝容忍苏格拉底,因为他们明白他并非无害，他公然挑衅，社会本质的生活方式,及他们视为崇高及值得的观念。

耶鲁公开课 - 政治哲学导论课程节选

"The EPRDF has discussed with parties that seem to approve or endorse its lines, not the serious parties that do challenge the EPRDF and do have serious issues about the political space in the country,"

VOA: standard.2009.11.01

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

Therefore,they are looking to have more compatible media to challenge those stations, which broadcast to Iran, and I do not think they are going to succeed, because of the limit they have in order to talk about issues we talk about.

VOA: standard.2009.11.16

Now the challenge is not just to get the DNA that encodes a gene into a cell, the challenge is to get it into the cell in a form where the cell can use it, can express it and make proteins from it.

现在的问题不仅在于,要将编码基因的DNA转进细胞,还要让它进入细胞之后,能够为细胞所用,能够表达并合成蛋白质

耶鲁公开课 - 生物医学工程探索课程节选

"I mentioned the killings of journalists and I said that it is a matter of grave concern not just to the United States, but to the people of Russia, and not just to the activists, but to the people who worry that unsolved killings are a very serious challenge to order and to the fair functioning of society.

VOA: standard.2009.10.14