1.the electromagnetic inverse scattering is one of most difficult problem due partly to its ill - posed , nonlinear and instability nature.
由于逆散射问题的求解存在病态性、非唯一性以及不稳定性，这给它的求解带来很大困难。
2.The question of water leakage from the cold fresh pork is always the difficult problem of the puzzle slaughter in the enterprise.
冷鲜白条肉出水问题一直是困扰屠宰企业的难题，也是影响白条肉质量的重要因素。
3.There's a tendency for people with that sort of background to just want a really difficult problem to solve.
拥有那种背景的人有一个倾向，即仅仅想要解决一个确实很难的问题。
4.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。
5.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。
6.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。
7.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。
8.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。
9.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。
10.I had puzzled over this difficult problem until yesterday I found a solution to it.
我—-一直被这一难题所困扰，直到昨天才找到了解决的办法。