"That character piece is the foundation. As we like to say, when you are put in very challenging environments, like the southern Helmand province of Afghanistan, or recently in western Iraq.

VOA: standard.2010.04.06

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

It can be very, very challenging.

这非常非常具有挑战性。

伦敦的出租车司机 - SpeakingMax英语口语达人

"The market is definitely very, very challenging. Our airline customers are feeling the pain of the situation and of the environment but clearly we're starting to see some signs of stabilization in the market in terms of the economy,".

VOA: standard.2009.06.16

And it's very challenging.

而且也很有挑战性。

学外语的时候 - SpeakingMax英语口语达人

"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

But it was very interesting and challenging.

但我觉得很有意思，很有挑战性。

第二外语，英语 - SpeakingMax英语口语达人