The corrosion of hydraulic turbine flow-parts has been a very difficult problem.
水轮机过流部件的磨损和破坏一直是水电站运行的难治之症。
It is a very difficult problem to look for the best equalization point between these two.
在这两者之间寻找最佳平衡点是一个困难的问题。
One morning Newton got up very early because Newton was working on a very difficult problem.
一天清晨，牛顿起得很早，因为他正在研究一个难题。
The automatic identification of seal imprints is a very difficult problem of pattern recognition.
印鉴自动识别是模式识别中的一项非常困难的课题。
To detect a moving point target that is submerged in noisy background is a very difficult problem.
要把淹没在噪声背景中的运动点目标检测出来是一个十分困难的问题。
The loose grain of pig garment leather is a very difficult problem manufacturing pig garment leather with modern style.
猪正面服装革松面是生产具有现代风格的猪正面服装革的一大难题。
Stock market forecasting is a very difficult problem for study and the forecasting support system is an effective method.
股票市场的预测是一个非常难的研究课题，建立股票预测支持系统是进行股票预测的一种有效手段。
However, it is well know that the random vibration analysis of vehicle-bridge coupling system is a very difficult problem.
而对车辆-桥梁这种复杂的耦合系统进行随机分析，历来被认为是一件非常困难的工作。
Stability and reliability evaluation of tunnel and underground engineering is a very difficult problem in rock and soil engineering.
隧道和地下空间工程的稳定性和可靠性评价的问题一直是岩土工程界关注的难点问题。
When a database encryption system is designed, the design of key-managing module is a very difficult problem and must be solved firstly.
密钥管理方案的设计是数据库加密系统设计时必须首先解决的一个难题。
Optimization of forming process is a very difficult problem due to high nonlinearity and huge computational cost of numerical simulations.
这主要是由于塑性成形数值模拟的高度非线性和大计算量特征，使得成形过程优化变得非常困难。
The disposal means of high concentration and poisonous organic waste liquid is a very difficult problem to the field of circumstance protection.
高浓度难生物降解的有毒有机废水，其处理方法一直是困扰环保领域的“老大难问题”。
Urban garbage disposal is a very difficult problem of urban management. Selection and distribution of garbage disposal field affect environmental quality.
城市生活垃圾的处理为城市管理的一大难题，垃圾填埋场地的合理选择与布局直接关系到场地四周的环境质量。
Identification of dynamic natural frequencies and viscosity damping coefficient for a large-scale structure in practical working condition is a very difficult problem.
大型构件在实际工作环境中的系统动态固有频率和粘性阻尼系数辨识一直是一个“棘手”的问题。
As the data points of 3d faces are huge in size and face has a complex physiological structure, thus establishing point-to-point correspondence is a very difficult problem.
由于三维人脸数据点多，人脸生理结构复杂，因而确立点对点的对应关系是非常棘手的问题。
Stress wave propagating in elastic structures under impact or explosive loading is a very difficult problem analytically. But the problem could be analysed by dynamic photoelasticity.
爆破与高速冲击载荷产生的应力波在弹性结构物中的传播，在理论分析上极为困难，但这类问题可以用动态光弹性法进行分析。
"It is a completely new approach to a very difficult problem," says Oriol Pujolas, a theoretician at the CERN laboratory, near Geneva, Switzerland. "Yet it's a very simple framework we know very well.
“这是对一个超级难题的一种全新尝试，”毗邻瑞士日内瓦的欧洲粒子物理实验所（CERN）的一位理论研究员，OriolPujolas说道，“而它却用的是一个为我们所熟知的非常简单的框架。”
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。
Traces are very useful to DB2 technical support representatives who are trying to diagnose a problem that may be difficult to solve with only the information that is returned in error messages.
对于那些DB 2技术支持代表，如果只凭错误消息返回的信息难于解决他们正试图诊断的问题，那么跟踪就非常有用。
We are now at the point where the dimensionality and size of the data is a big problem. It makes things computationally very difficult to find these patterns we want to find.
他补充道，“在这里，数据的维数和容量是个大问题，要依靠计算来找到我们想要找寻的模式会变得极为困难。”
The second problem is that it is very difficult to express a wide range of complex policies using this notation.
第二个问题是使用这种表示法表达许多复杂的策略非常困难。
Not only is this problem very important, but it is a difficult problem to be solved at once.
这个问题不仅十分重要，而且还是一个马上要解决的困难问题。
Obviously this is a difficult problem, but the incentive to solve it is very big. The main approaches fall into the following categories.
显然，这是一个很困难的问题，但是解决它的激励也很大。
Whopper had a problem. He tried to tell the truth but it was very difficult for him.
华勃碰到难题。他想说出真相，但是这对他而言却很困难。
This shows how, by very simple means, in a family constellation we can reach a solution for such a difficult problem.
这个案例以非常简单的方式告诉我们，在一个家庭系统中我们可以为这样的难题找到一个解决方案。
However, such a problem is very difficult in general, even for primitive groups and it depends heavily on the understanding of abstract groups and the application of combinatorial tools as well.
然而，即使对于本原群，其次轨道的决定也是一个非常困难的问题，它依赖与人们对抽象群本身结构的了解和一些组合方法的应用。
It is kind of you to help us handle this tough problem in your spare time because it is very difficult for us to think of a means as feasible as yours.
你能在业余时间帮助我们解决这个棘手的问题真是太好了，因为我们很难想到和你一样行之有效的办法。
It is kind of you to help us handle this tough problem in your spare time because it is very difficult for us to think of a means as feasible as yours.
你能在业余时间帮助我们解决这个棘手的问题真是太好了，因为我们很难想到和你一样行之有效的办法。
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