您要查找的是不是：
- NP-hard难题NP-- hard problem
- 难题difficult problem
- NP-hardNP-hard
- 大难题hang-up
- NP-hard问题NP-hard problem
- 脑筋急转弯一个考验智力的问题或难题A mentally challenging problem or puzzle.
- 城市委员会遇到各种难题The city council is beset by problems.
- Hard E综合征Hard E syndrome
- np边界np boundary
- hard money (美国)现金
- hard money (硬币)硬通货
- 我刚才灵机一动，突然想出了一个解决这一难题的新办法！I've just had a brainwave; I know a new approach to the difficult problem!
- NP难NP hard
- hard mouth (禽类)硬嘴
- 他提出了一个难题。He put forward a baffling question.
- NP-难NP-hard
- hard wax(嫁接用)硬蜡
- 2-NP2-nitrophenol
- 老师给学生出了一道难题。The teacher set his pupils a difficult problem.
- hard bread (救生艇用)压缩饼干
