难题；难问题

difficult process───艰难的过程

significant problem───重要的问题；重大问题

difficult opponent───难对付的对手

particular problem───特殊问题

difficult issue───难题

difficult period───困难时期

difficult time───困难时期

medical problem───医学问题

physical problem───物理问题；实际问题

Our professor is too capable not to solve this difficult problem.───我们教授非常有才干,必定能解决这一难题.

Comprehensiveness characterizes the most difficult problem of geographical science.───综合性是地理学最高层次的科学难点问题.

She is working at a difficult problem in mathematics.───她在做一道数学难题。

Eyelet phenomenon is a difficult problem in Image recognition.───:图像识别是计算机应用领域中的前沿技术,小内孔现象是导致识别率低的主要因素之一.

Fault diagnosis is a complex and difficult problem that concerns effective decision - making.───摘要故障诊断是与有效决策密切相关的复杂问题.

The test of shock wave is a difficult problem in dynamic measurement.───冲击波的测试是动态测试中难度较大的测试问题.

This difficult problem be solved by mounting winglets on the stabilizing wing.───采用在稳定翼上加装小襟翼的方法,即可以解决这一难题.

The teacher set his pupils a difficult problem.───老师给学生出了一道难题.

The difficult problem presented by him entangled the conferees.───他所提出的问题使与会人士感到困惑.

These are the new difficult problem that are placed before undertaker.───这些都是摆在承办人面前的新难题.

The student decided to work out the difficult problem by himself.───这个学生决心独自解决这道难题.

He tried all manner of ways to solve the difficult problem.───为了解决那道难题,他试了各种方法.

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。

With factory's heterogeneous ship, this difficult problem will be easily solved.───用我厂的异型船, 这个难题就会迎刃而解.

When small fish face an extremely difficult problem,they deal with it by forming a school.───当小鱼面临极其困难的问题时，他们会立刻形成鱼群。

In itself, it's not a difficult problem to solve.───这本身并不是个难解决的问题。

Hers is an honest response to a difficult problem.

We're trying to solve the difficult problem by ourselves.

How to quiet title is still a difficult problem.

It's really a difficult problem.

In itself, it's not a difficult problem to solve.

He soon turned his attention to the difficult problem.

We will tackle this difficult problem.

The second, more difficult problem is that of ensuring that your reader understands what your technical terms mean.

On the surface, this seems like a difficult problem, but in fact there's an easy solution to it.