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1、roll up
卷起(袖子或裤腿)
The jacket was too big for him so he rolled up the cuffs.
这件夹克他穿着太大了，就把袖口卷了起来。
Walking in the surf, she had to roll her pants up to her knees.
她走在海浪里，不得不把裤腿卷到膝盖处。
到达;（尤指）涌向，涌到
Roll up, roll up, come and join The Greatest Show on Earth.
快来呀，快来呀，来一起看“地球上最精彩的演出”。
The first reporters rolled up to the laboratory within minutes.
第一批记者在几分钟之内就涌到了实验室。
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。
