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。

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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

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

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

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

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

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