1、confirm

证实，证明(情况属实)

X-rays have confirmed that he has not broken any bones.

X光片证实他没有骨折。

These new statistics confirm our worst fears about the depth of the recession.

这些新的统计数据证实经济衰退已经严重到我们最为担忧的境地。

（某人）证实，肯定，确认

The spokesman confirmed that the area was now in rebel hands.

这位发言人证实该地区现已落入叛乱分子手中。

He confirmed what had long been feared.

他证实了人们长期以来的担心。

使坚定，使确信(自己的决定、信仰或观点)

It has confirmed me in my decision not to become a nun.

这使我更加坚定了不做修女的决心。

2、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。