1·It was a rather difficult question.
这是个相当难的问题。
—— 《牛津词典》
2·It was rather a difficult question.
这真是个难题。
—— 《牛津词典》
3·They tried to catch her out with a difficult question.
他们试图用一道难题难倒她。
—— 《牛津词典》
4·The difficult question tripped us.
这道难题我们答错了。
5·He tripped on that difficult question.
他答错了那道难题。
6·The difficult question tasked my brain.
这个难题使我绞尽脑汁。
7·The difficult question is how to find that profitable niche and protect it.
这个难题是：如何找到有利可图的利基市场并加以保护。
8·He embarrassed me with a difficult question.
他用难题来窘我。
—— 《新英汉大辞典》
9·It's an interesting and difficult question.
这是个有趣而困难的问题。
10·MF: This is a difficult question to tackle.
MF：这个问题很难回答。