It is very difficult to determine the cause of a problem that only occurs sometimes.
只有偶尔会发生的问题是很难确定问题的起因的。
It is very difficult for solving the planning and scheduling problem because of its complexity.
由于计划调度问题本身的复杂性，很难寻求到最优解。
Not only is the problem very important, but also it is difficult to solve.
这个问题不仅重要，而且难以解决。
The method is very efficient for solving a difficult problem in gear design programming.
此法有效的解决了齿轮设计编程中的一个难题。
Although he is very clever, he thought it was difficult to solve the problem neither.
虽然他聪明机智，也觉得解决这个问题很难。
Although he is very clever, he thought it was difficult to solve the problem neither.
虽然他聪明机智，也觉得解决这个问题很难。
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