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。
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。
There are many Problems difficult to be solved in the information organizations in our country.
认为我国的情报机构，存在着许多难以解决的问题。
The flow of high viscosity material is very complex, so it is difficult to be solved by the method of analysis.
高黏度物料在双螺杆挤出机中的流动情况非常复杂，很难用解析法求解。
However, the load complexity and randomicity caused by plenty of influence make it very difficult to be solved well.
然而，由于众多影响因素造成的复杂性和随机性使得短期负荷预测没能得到较好的解决。
There exist a lot of composite optimization problems in power systems, which are difficult to be solved by usual methods.
电力系统中有许多混合优化问题，采用常用方法求解难以奏效，而模拟进化方法是一种新型有效的优化方法。
Therefore, optimal design problems of complex AT plans for equipment are difficult to be solved by analytical approaches.
因此，解析优化方法在装备的复杂加速试验方案优化设计中难以应用。
Because TSP is known to be a NP - complete problem in theory, it is too difficult to be solved with traditional optimal methods.
由于TSP问题在理论上属于NP完备问题，很难用一般的算法求解。
Intelligent control is a method mainly to solve complex system problem which is very difficult to be solved by classical methods.
智能控制主要用来处理传统方法难以解决的复杂系统控制问题。
When the maximal uncontrollable subnet is loop-in, the problem is a nonlinear integer program (NIP), which is difficult to be solved.
当最大不可控子网中有环时，控制律的求解变成了非线性整数规划(NIP)问题，而NIP问题的求解是非常困难的。
Distribution network planning is a nonlinear mixed integer program problem which is usually difficult to be solved by conventional optimization algorithm.
配电网络规划属于非线性混合整数规划问题，应用传统数学优化算法往往难以直接求解。
The drawing process of thick wall is a problem of geometry non-linear and material non-linear, so it is very difficult to be solved by the method of elasticity and plastics mechanics.
而厚壁封头冲压成形过程属于几何非线性和材料非线性的问题，很难用弹塑性力学理论的解析法进行研究。
The problem of minimum cost multicast tree satisfying bandwidth request and delay-constraint in communication network is a NP-complete problem. It is difficult to be solved by traditional methods.
通信网络时延受限且满足带宽要求的最小代价组播树问题是NP完全问题，传统方法难以求解，一般采用启发式方法求解。
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。
How to evaluate course important level is a difficult problem that must be solved for designing courses scientifically.
如何评价课程重要程度，是科学规划课程必须解决的难题。
In many cases, the problems that you are facing don't appear to be so difficult, which can be solved easily and don't need so much knowledge and skill.
大部分情况下，你所面对的问题其实都不会很困难，你不需要很多知识与技能就可以轻易把它解决。
It is very difficult to make trajectory correction for high-speed rotating projectile because of rotating characteristic, which can not be solved by adopting the traditional correction projects.
解决由于高速旋转弹丸的旋转特性导致难以采用常规方案对其进行弹道修正的技术难点。
The separation of hematite from iron-bearing silicate minerals is a difficult problem to be solved in the practice of processing Bayan Obo ores of Baotou iron and Steel Campany.
包头白云鄂博矿床的选矿实践迫切地要求解决赤铁矿与含铁硅酸盐矿物分离这一难题。
This nice and difficult problem could only be solved in relation to the news and events from week to week.
这一细致而困难的问题，只能和每周的消息和事态联系起来才能得到解决。
The symmetric key systems compared with asymmetric key systems have astounding speed benefits, but managing their keys has always been difficult problem to be solved.
对称密钥系统较之非对称密钥系统具有惊人的速度优势，但是管理对称密钥系统的密钥却是需要解决的一个难题。
According to the paper many difficult problems of automatic recognition of underwater targets would be likely solved.
按照给出的方法，很可能能够解决水下目标自动识别中的许多难题。
The original law and regulations have gradually presented defects, so that the creditors are difficult to get fair pay, this can be only solved by perfecting the law of bankruptcy.
原有破产法律规范已逐渐显出不足，债权人难以获得公平清偿。
Results The results showed that the DDAs were solved and reduced by hydrolysis reaction, and the lipo-alkaloids were difficult to be soluted in the Decoction.
结果在煎煮过程中双酯型生物碱溶解并发生水解反应 ，而脂类生物碱则难溶于水。
Not only is this problem very important, but it is a difficult problem to be solved at once.
这个问题不仅重要，而且还是一个难于马上解决的问题。
Erathquake prediction is a difficult task of geoscience to be required imminently answer, and don't to be solved until it is only searched a long time.
地震预测是一个既紧迫要求予以回答、又需要长期探索方能最终解决的地球科学难题。
The machining of titanium alloys classified as 'difficult-to-machine' materials is being a major problem to be solved in the aerospace industry.
钛合金是一种难加工材料，如何提高钛合金加工效率的问题一直是航空航天业以及其它行业制造技术中迫切需要解决的难题。
The study on a frozen wall forming affected by seepage water is not only an important and difficult problem , but also an urgent one to be solved in the Artifical Ground Freezing engineering.
研究渗流水作用下冻结壁形成是冻结法凿井的一个重点和难题，也是冻结工程迫切需要解决的问题。
While vessel is in port cooling sea water is supplied by port service cooling sea water pump, Marine growth preventing system is very difficult to use and not safety for operation, to be solved.
船舶在港时，冷却的海水由港内海水冷却泵完成，很难启用海上防污系统且操纵不安全，待解决。
For so many complex factors can affect mechanical Joints, it is difficult to obtain a prcise result, so there are still some problems need to be solved.
由于影响机械结合部的因素很多，而且复杂，因此对它的研究工作也有一定的困难，迄今为止仍然有一些问题尚未解决。
For so many complex factors can affect mechanical Joints, it is difficult to obtain a prcise result, so there are still some problems need to be solved.
由于影响机械结合部的因素很多，而且复杂，因此对它的研究工作也有一定的困难，迄今为止仍然有一些问题尚未解决。
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