1、challenge

挑战;难题

I like a big challenge and they don't come much bigger than this.

我喜欢大的挑战，而所有挑战中再没有比这更大的了。

The new government's first challenge is the economy.

新政府面临的第一个难题是经济问题。

(成功地)应对挑战，迎接挑战

The new Germany must rise to the challenge of its enhanced responsibilities.

一个崭新的德国必须迎接挑战，承担更多的责任。

They rose to the challenge of entertaining 80 schoolchildren for an afternoon.

他们一个下午成功接待了80名学童。

怀疑，质疑(真实性、价值、权威等)

Democratic leaders have challenged the president to sign the bill.

民主党领袖对总统签署这项法案提出了质疑。

The move was immediately challenged by two of the republics.

此项动议立即遭到其中两个共和国的反对。

2、intelligent

聪颖的;有才智的;有灵性的

Susan's a very bright and intelligent woman who knows her own mind.

苏珊是个非常聪明、有主见的女子。

lively and intelligent conversation.

生动有趣、聪明睿智的谈话

能思维的;智能的

An intelligent computer will be an indispensable diagnostic tool for doctors.

智能计算机将成为医生不可或缺的诊断工具。

the biggest-ever search for intelligent life elsewhere in the universe.

有史以来规模最大的寻找外星智能生命的行动