The concept and idea of reliability of system has been accepted in the design and analysis of building structures, but its calculation is a difficult point all the while.
在建筑结构的设计与分析中，结构体系可靠度的概念和思想已日益为人们所接受，但它的计算却一直是一个难点问题。
I hit a difficult point in my work, and decided it was time for a cup of tea.
我在工作中遇到了一个困难，因此打算先喝杯茶休息一下。
In TCSL intonation teaching and learning, neutral tone is a focus as well as a difficult point.
对外汉语语音教学中，轻声是语音教学的重点和难点。
Therefore, the stability of machining thin-walled parts is always a difficult point in high-speed machining.
因此，薄壁零件的切削稳定性一直是高速切削加工领域内的一个难点。
The derivation of acid base titration error formula is a difficult point as well as an important point in teaching analytical chemistry.
酸碱滴定误差公式的推导是分析化学教学的一个难点，也是一个重点。
Classifying manuscripts automatically is a difficult point of the thesis.
稿件上传自动分类是本系统的一个难点。
Defective capital equity transfer is a difficult point of business theory and judicial practice of law.
瑕疵出资股权转让，是近年来困扰商法学理论界和司法实践的一个难点。
Infinite integral is a type of improper integral in calculi, and it is also a difficult point in integral.
无穷限积分是微积分学中广义积分的一种类型，是积分知识的一个难点内容。
The investigation of Quyuan "being exiled" is a difficult point at issue in researching into Quyuan s life.
屈原放逐问题的研究，是屈原生平研究的一个热点和难点。
In the design of die casting die with screw thread, the automatic screw thread unloading is a difficult point.
铸件螺纹脱模是压铸模设计的难点之一。
Thevenin′s theorem is a difficult point in the teaching of Circuit Base because it is too hard to be understood.
戴维南定理由于内容抽象、难懂，成为《电路基础》课程中的教学难点。
Owing to a lot of uncertain factors influencing the grain yield, its prediction has always been a difficult point.
粮食产量受到多个不确定因素的影响，它的预测历来是一个难点。
The computation of utilizable water resources volume is always a difficult point in regional water resources evaluation.
水资源可利用量计算一直是区域水资源评价中的难点。
The prediction of reservoirs is a key point as well a difficult point in exploration for subtle petroleum accumulations.
在隐蔽油气藏勘探中，储层预测既是关键点又是难点。
The standard assessment of competence is a difficult point to be appraised in the teaching of higher vocational education.
能力本位评价是高职教育教学评价的难点。
The evaluation and regional election of coalbed gas are the bases of developing coalbed gas, being also a difficult point.
煤层气评价选区是煤层气开发的基础，也是难点。
The automatic screw thread unloading is a difficult point in the design of die casting die for castings with screw thread.
铸件螺纹脱模是压铸模设计的难点之一。
It is a difficult point to teach the students solving the wave equation on finite interval by the reflection law of the wave.
用波的反射原理求解有限区间上的波动方程是数学物理方程中的基本内容，也是教学中的难点内容。
Chinese to English translation is a difficult point in learning English as well as an aspect for measuring English competence.
汉译英是学习英语的难点，也是衡量英语能力的一个方面。
The diagnosis of compound fault is always a difficult point, and there is not an effective method in equipment diagnosis field.
在设备故障诊断领域，复合故障的诊断一直是一个难点，缺乏行之有效的诊断方法。
It is a difficult point to set the parameters and to initiate the operation of accounting software on the computerized accounting.
通用财务软件的参数设置与初始化操作是会计电算化的一个难点。
In petroleum industry, the steady-steady modeling of slug flow has always been a difficult point in multiphase pipeline calculation.
在石油工业中油气混输管道中的段塞流的水力计算一直是多相流管道稳态工艺计算中的难点。
Concept drift, as a difficult point in the field of data stream mining, is generated with the accompany of time-varying data streams.
概念漂移是数据流分类挖掘中的一个难点，它是伴随着数据流的时变性而产生的。
To determine the equivalent of the component measured is a difficult point in process of calculating the result of titration analyses.
如何把握被测组分的当量，是滴定分析计算的难点。
In numerous problems encountered in forensic pathology, the time issue is of central importance and also a difficult point to elaborate.
在法医病理学研究的诸多重要问题中，时间问题无疑是其中的一个热点问题，同时也是一个难点问题。
Background and objective Finding the cancer cells in pleural fluid of patients with lung can-cer by conventional cytology is always a difficult point.
背景与目的常规细胞学查找肺癌患者胸腔积液中的癌细胞始终是难点。
The difficult excavation is a difficult point in construction of wind-blown sand tunnel, thus, to ensure smooth going of excavation is a stress of excavation work.
风积砂隧道的施工难点是开挖难，如何保证开挖工作的顺利进行就成为开挖工作的重点。
How to solve the problems of the safety and stability of the surrounding rock is a difficult point for the design and construction of Longtan Underground Power House.
如何解决好围岩的安全稳定是龙滩地下厂房设计和施工的难点问题。
How to solve the problems of the safety and stability of the surrounding rock is a difficult point for the design and construction of Longtan Underground Power House.
如何解决好围岩的安全稳定是龙滩地下厂房设计和施工的难点问题。
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