I have a lot of problems to think about
难题───difficult problem;思考───reflection
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。
The teacher set his pupils a difficult problem.───老师给学生出了一道难题.
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.
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。
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.
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.
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.
In itself, it's not a difficult problem to solve.
We're trying to solve the difficult problem by ourselves.
Hers is an honest response to a difficult problem.
The second, more difficult problem is that of ensuring that your reader understands what your technical terms mean.
He soon turned his attention to the difficult problem.