It is a problem difficult to solve.
这是一个难解决的问题。
I meet a problem difficult to solve.
我遇到一个难以解决的问题。
It is a problem difficult to work out.
这是一个难以解决的问题。
It is a problem difficult to work out.
这是一道难以解决的问题。
Power network planning is a NP hard problem difficult to be solved.
电网规划是一个较难解决的NP难问题。
Completion stealing is a problem difficult to deal with in protocol communication between CPU and PCI bus.
事务窃取一直是困扰CPU与PCI总线实现协议通信的难题。
We will show that the traditional mixed integer programming approach makes the problem difficult to represent and solve.
我们将说明传统的混合整数规划方法使问题难以描述和解决。
Incrustation of evaporator liquid room was the general existence and a problem difficult to solve in black liquid evaporation.
造纸黑液治理技术中，蒸发器结垢是黑液蒸发中普遍存在而难以解决的问题之一。
Rapid removing of compressed snow on urban roads has been a problem difficult to solve. There is no efficient and practical machine for it presently.
城市道路压实积雪的快速清除一直是较难解决的问题。目前，仍没有高效实用的除雪机械。
Synergistic effects, nonlinear variation, and difficulties in discounting the future make the intellectual problem difficult, but not (in principle) insoluble.
这项智力难题因协同作用，非线性变化，和考虑将来而变得困难，但(原则上)不是不可能解决。
In itself, it's not a difficult problem to solve.
这本身并不是个难解决的问题。
To anticipate every imaginable driving situation is a difficult programming problem.
预测每一种可能的驾驶情况是一个困难的编程问题。
To work out the difficult maths problem, I have consulted Professor Russell several times.
为了解决困难的数学问题，我多次咨询罗素教授。
Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.
从极热的而干燥的岩石中提取热量，暴露出了一个更加困难的问题：必须击碎岩石以保证水的循环，而水必须是人工提供的。
One problem is I don't have a background in IT and sometimes I get asked difficult technical questions during interviews which I just can't answer.
一个问题是我没有IT背景，有时候在面试中被问到一些技术性的难题，我无法回答。
Objective assessment of the severity of the problem was difficult.
难以客观判定该问题的严重性。
It was difficult to explain the problem to beginners.
对初学者解释这个问题很难。
It's difficult to define the exact nature of the problem.
很难给这个问题确切定性。
Why is the obesity problem in Britain so difficult to solve?
为什么英国的肥胖问题如此难以解决？
The promise of finding long-term technological solutions to the problem of world food shortages seems difficult to fulfill.
为世界粮食短缺问题找到长期技术解决方案的希望似乎很难实现。
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。
These methods may be useful for a while, but it is difficult to solve this problem completely.
这些方法可能暂时有用，但要完全解决这个问题是很困难的。
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。
By the time he was 14, he had studied advanced math on his own. It was the reason that he could answer the difficult math problem.
到他14岁的时候，他已经自学了高等数学，这也是他能够解答这道难题的原因。
This mathematics problem is extremely difficult.
这道数学题难度很大。
Has Jack solved the difficult math problem?
杰克解出这道数学难题了吗？
He worked out such a difficult math problem.
他解出了一道如此难的数学题。
No matter how difficult the problem is, think about it by yourself first.
不管问题有多难，首先要自己思考。
No matter how difficult the problem is, think about it by yourself first.
不管问题有多难，首先要自己思考。
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