Challenge 用于不同的情况,其翻译如下:
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http://www.howjsay.com/index.php?word=challenge&submit=Submit1)challenge n (sthg difficult) 困难,挑战 n
Fixing the car was a challenge.
修车真是个巨大的挑战。
2)challenge vtr (be difficult) 能力、技巧等 考验,考察 vtr
Fixing the car really challenged me.
修车真是考验我啊!
3)challenge vtr (to a game, etc.) 比赛等 向…挑战 vtr
Alex challenged me to a game of pool.
亚利克斯向我挑战,要和我比赛打台球。
opportunity 用于不同的情况,其翻译如下:
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http://www.howjsay.com/index.php?word=opportunity&submit=Submit1)opportunity n (possibility of action) 机会,时机 n
There might be an opportunity to ski while we are there.
在那里我们可能有机会去滑雪。
2)opportunity n (a lucky occasion) 良机,好机会 n
We have an opportunity to buy the house at an excellent price.
我们有机会用合算的价钱买下那栋房子。
满意我的答案的话,请考虑给个“最佳答案”吧。。。因为在进行任务。。。谢谢。。本回答被提问者采纳