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1、condition
状况;状态
He remains in a critical condition in a California hospital.
他在加州的一家医院里，病情仍然十分危急。
I received several compliments on the condition of my skin.
好几个人夸我的皮肤保养得好。
(某事完成或发生的)环境，条件
This change has been timed under laboratory conditions.
在实验室条件下测得了这一变化所需的时间。
The mild winter has created the ideal conditions for an ant population explosion.
暖冬为蚁群数量激增创造了理想的条件。
(某一群人的)生活状况，境况;(尤指)艰难处境
The condition of the people could be elevated by a programme of social reform.
人们的生活状况可以通过社会改革方案得到改善。
The government has encouraged its people to better their condition.
政府鼓励人民改善生活状况。
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。
