这是一个难的问题 This is a difficult question
只问一个难回答的问题 Only One Difficult Question
一个还要难的问题 a still more difficult question
一个非常困难的问题 A very difficult problem
这是一个超级难的问题。
这场辩论让很多职场人士不得不直面夏天的一个问题：随着越来越多的公司倡导休闲的办公环境，职场人越来越难确定什么该穿什么不该穿了。
The controversy highlights a problem that many workers will face this summer: as companies embrace a more casual environment, it's hard to know what's appropriate and what's not.
另外我认为你的问题有很多种答案，不过这确实是一个非常难的问题。
And I think there are many potential answers there. It's a very difficult question.
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