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。
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。
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！
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。
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。
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。
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。
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