Bush's Republican Party faces a tough challenge in midterm congressional elections in November.

布什的共和党在11月中期国会选举中面临艰难的挑战。

《柯林斯英汉双解大词典》

I think that it's true that the economy is difficult and there is a big challenge in front of us.

我认为经济形势确实很困难，我们面临着巨大的挑战。

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This is a challenge in itself.

这本身就是一个挑战。

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It is expected that Democrats will have a tougher challenge in motivating their supporters to get out to vote this year.

VOA: standard.2010.05.04

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

He ran 31 miles at each location, and completed the challenge in five-and-a-half days.

BBC: Andrew Murray

Business strategist Jim Collins takes on this challenge in his latest book, How the Mighty Fall.

FORBES: Jim Collins's ''How the Mighty Fall.''

Obama, throughout his career, has faced a challenge in how best to manage his political antecedent.

NEWYORKER: Let��s Be Friends