大火的起因对警察来说是个难解的问题。
他如何能到这来，对我来说是个难解的问题。
我每星期的钱都到哪去了是一个难解的问题。
不幸的是，我们在这样做时碰到了一些纠缠难解的问题。
这本身并不是个难解决的问题。
这是一个很难解决的问题。
丢失或者不稳定的包信息可能是最难解决的问题。
Missing or inconsistent package information is probably the most difficult problem to solve.
这是一个很难解答的问题，因为它有那么多的答案。
It's a difficult question to tackle because there's so very much to it.
针对系统的性能问题常常是非常难解决的。
A performance problem with a system is often very hard to solve.
所幸的是，这个问题不难解决(见清单6)。
Fortunately, it's not a difficult problem (see Listing 6) to fix.
这些是很难解决和进退两难的问题。
笔者意识到这是一个很难解释的问题。
I have come to realize that this is a poorly worded question.
我们的文化很难解答这个问题。
由于还有几项重要的未知数，所以这问题的解答仍然晦涩难解。
如果没有SKIPLOCKEDDATA这样的数据库概念，这个问题是很难解决的。
Without a database concept such as SKIP LOCKED DATA, this problem is difficult to solve.
不过，在时间管理专家看来，这也并不是特别难解决的问题。
However, in the opinion of the time management expert, this also is not particularly difficult problem.
有些时候，我们往往为了解决一个问题，却因此制造了一个更难解决的难题。
Sometimes in order to solve a problem we create a bigger problem while solving it.
物理问题是最难解决的问题。
Physical problems are the most serious that confront any property owner.
但鱼不可能被下令做任何事情，这是一个难解决的问题。
But fish can't be ordered to do anything. It was quite a problem.
它成了我们时代最难解决的问题。
点覆盖问题是一个重要的有实际意义的难解问题。
Point covering problem is hard to solve with great actual value.
电网规划是一个较难解决的NP难问题。
Power network planning is a NP hard problem difficult to be solved.
这对我来说是一个太难解决的问题。
工程图纸的矢量化过程中，噪声的正确消除一直是比较难解决的问题。
In the process of getting vector drawing, how to remove the noises is always difficulty.
至今，这个问题仍然是个难解的谜。
这些算法主要是解决优化问题中的难解问题。
They are mainly applied to solve difficult optimization problems.
这些算法主要是解决优化问题中的难解问题。
They are mainly applied to solve difficult optimization problems.
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