You don't have any problems
难题───difficult problem;没有───No,
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。
Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.───从极热的而干燥的岩石中提取热量，暴露出了一个更加困难的问题：必须击碎岩石以保证水的循环，而水必须是人工提供的。
itself, it's not a difficult problem to solve.───这本身并不是个难解决的问题。
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。
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。
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。
The second, more difficult problem is that of ensuring that your reader understands what your technical terms mean.
We're trying to solve the difficult problem by ourselves.
How to quiet title is still a difficult problem.
We will tackle this difficult problem.
Hers is an honest response to a difficult problem.