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难题
1、problem───n.难题；引起麻烦的人；adj.成问题的；难处理的
2、recognizing a problem───认识到问题
3、a problem───一个问题
4、cause a problem───引起问题
5、difficult───adj.困难的；不随和的；执拗的
6、a difficult───困难的
7、face a problem───面对一个问题
8、encountered a problem───遇到问题
9、difficult problem───难题；难问题
1、The evaluation of radar antijamming performances has always been a difficult problem.───雷达抗干扰性能评估一直是一个技术难题。
2、The question of fund is a difficult problem which is not easy to solve in our rural economic development throughout.───在我国农村的经济发展中，资金问题始终是一个不易解决的难题。
3、How to improve the quality of products was a difficult problem to him.───如何提高产品质量对他来说可是个难题。
4、It is such a difficult problem that none of us can work it out.───这个问题太难了以致于没有人能够做出来。
5、On the surface, this seems like a difficult problem, but in fact there's an easy solution to it.───表面看来这是个难题，实际上很容易解决。
6、She is working at a difficult problem in mathematics.───她在做一道数学难题。
7、Dropout issue of elementary school students has always been a difficult problem for education leadership at all levels.───小学生辍学问题一直是各级教育领导的一个难题。
8、A difficult problem could be good for a designer, but a fickle client or unreliable materials would not be.───一个困难的问题对一个设计者来说是好的，但是一个多变的客户和不可靠的材料不是。
9、itself, it's not a difficult problem to solve.───这本身并不是个难解决的问题。
1、Hers is an honest response to a difficult problem.
2、Where to turn the corner is a difficult problem.
3、A difficult problem to solve in GEP is analyzed that is the contradiction between algorithm convergence and population diversity and the premature phenomena.
4、Jointer of offense is a difficult problem in theory and practice of criminology, and imaginative jointer of offenses causes more disputes for its unique structure.
5、The test of shock wave is a difficult problem in dynamic measurement.
6、It's really a difficult problem.
7、How to quiet title is still a difficult problem.
8、On the surface, this seems like a difficult problem, but in fact there's an easy solution to it.
9、In itself, it's not a difficult problem to solve.