He is engaging in dealing with a very difficult problem.
他正忙于处理一个棘手的问题。
If more than a few weeks go by, we might have a real problem that would very difficult to fix in time for you to graduate.
如果好几个星期过去了，我们可能会面临一个真正的问题，这个问题我们很难在你毕业的时候解决。
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。
Here, the problem gets very difficult.
这是个棘手的问题。
Such a difficult problem you can answer very complete, is really something!
这么难的题你能回答得很完整，真是了不起！
The orbit of one particular comets was a very difficult mathematical problem.
一个特殊彗星轨道是一个非常困难的数学问题。
At first glance, the problem seems very difficult.
初看起来，那个问题似乎很难。
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。
I found (it) not very difficult to solve the problem.
我感到解决此问题不难。
But it is very difficult to use a formula in working out a maths problem.
但用公式解决某个数学问题却很难。
We found the problem very difficult.
我们发现这个问题很难。
A problem is very difficult to solve.
很难处理的问题。
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。
Not only is that problem very important, but it is very difficult to be solved.
那个问题不仅十分重要，而且还难于解决。
It's very difficult to work out the math problem.
做出这些数学题很困难。
The maths problem seems to be very difficult to work out.
这道数学题似乎很难解决。
To Protect very short high voltage transmission lines is a difficult and urgent Problem.
高压短距离输电线的继电保护方式是一个困难而急待解决的问题。
Fault diagnosis of reciprocating engine is a very difficult and popular problem.
发动机的故障诊断是较困难和热点的研究问题。
Machine translation is an open problem while its evaluation is also very difficult.
机器翻译是项很困难的研究课题，而机器翻译评价也不是一件容易的事。
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。
The problem seems very difficult.
这个问题看起来很难。
The problem seems very difficult.
这个问题看起来很难。
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