That's not what we have. It's a state-driven measure. High standards,challenging work for young people across the country.

VOA: special.2011.06.09

I think we're--he's had a spectacular return, but he's getting into a challenging year.

但他过去确实获得了惊人的收益,但今年年景不好

耶鲁公开课 - 金融市场课程节选

so it's a very challenging and a place to grow.

所以这很有挑战，也是让人成长的地方。

喜欢加州 - SpeakingMax英语口语达人

There were a number of pending bills in different legislatures challenging fair employment practices.

VOA: special.2009.04.05

And I'd like to leave you with a challenging question.

下面我想留给你们,一个具有挑战性的问题。

麻省理工公开课 - 媒体、教育、市场课程节选

In a brief statement from the White House, Mr.Obama stressed this will be a complex and challenging operation.

VOA: standard.2010.01.13

We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.

我们现在离夏天更近了,这样空气中不总是,充满额外的静电，所以这时做实验,会有一些挑战性。

麻省理工公开课 - 化学原理课程节选

In bad times, the desert turns into a barren wasteland, challenging the survival skills of even the hardiest of people and their animals.

VOA: standard.2009.10.06

I think this is as good list so let's go and think about what might be a little bit more challenging.

我想上面这些都是很好的例子,接下来我们思考一些更有挑战的问题

耶鲁公开课 - 生物医学工程探索课程节选

"It is extraordinarily challenging and that is why Calderon is fighting a war on multiple fronts,"

VOA: standard.2009.12.18

We differ from lower animals and our brains, which are much more capable of storing and processing information, but we're living in a time of revolution when machines are challenging or competing with our brains.

我们不同于其他低等动物，我们的大脑更能够存储和处理信息，不过身处改革年代,机器开始挑战甚至是,和我们的大脑开始竞争。

耶鲁公开课 - 金融市场课程节选

Despite some of the most challenging economic conditions in decades, American consumer confidence jumped unexpectedly this month, a sign that widespread pessimism might be dissipating.

VOA: standard.2009.08.25

If you run a business, how would you answer them? It's challenging.

如果你也经营一个企业，会怎么回答，有挑战性。

麻省理工公开课 - 媒体、教育、市场课程节选

But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

Is anyone else pre-med here? Okay, so a pretty good showing. So maybe you can relate to some of the reasons I wanted to be pretty pre-med -- part of it was the interest in the science and the biology. Also, I wanted to help people -- it seemed like a really clear way that I could have a career that was challenging and involved in science, but also helping others.

你们中有医学预科的吗？,不错，有不少人,也许你们出于和我当年,想读医学预科一样的原因,一方面是受灾科学和生物学方面兴趣的驱使,另一方面,我想帮助别人,所以我似乎应该选择。

麻省理工公开课 - 化学原理课程节选

"Being more socially engaged in your community - maybe in environments which aren't always just the same, a little bit more challenging socially - may be a very good thing.

VOA: standard.2010.07.14

It is a long-term endeavor and we both are united to fight against this endeavor, which is challenging our way of life and wants to challenge the way of life with the world."

VOA: standard.2009.05.13

"We don't want to be rebels and betray our families, but we do want to leave home and do interesting and challenging things that maybe our families don't understand because they are still stuck in the old world a little bit.'" In the novel,Gabi faces another dilemma.

VOA: standard.2010.07.22