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、explore

在…探险;探测;勘察;考察

I just wanted to explore Paris, read Sartre, listen to Sidney Bechet.

我就想逛逛巴黎，读读萨特的作品，听听悉尼·贝谢的音乐。

After exploring the old part of town there is a guided tour of the cathedral.

游览完老城区之后，会由导游带队参观大教堂。

探讨，研究（观点或建议）

The secretary is expected to explore ideas for post-war reconstruction of the area.

部长预计将会探讨这个地区战后重建的意见。

The film explores the relationship between artist and instrument

这部电影探究了艺术家和乐器之间的关系。