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。
Industrial layout is a very vital issue but a difficult point.
产业布局是一个非常重要的问题，也是一个难点。
The tense teaching is a difficult point in English grammar teaching.
英语语法教学中时态的教学是一个难点。
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。
Mode analysis is a difficult point in teaching about basic music theories.
调式分析是音乐基础理论教学中的一个难点。
The price of information products is a difficult point in information theory.
信息商品的定价问题一直困扰着我国信息理论界与实践界。
The rhetorical problem is a always a difficult point worthy of notice in translation.
英汉语言中的修辞是翻译中的一个不容忽视的因素，也是翻译中的一个难点。
How to improve listening comprehension is a difficult point in college English teaching.
如何提高听力水平是大学英语教学中的一个难点。
The clinical practice of obstetrics and gynecology is a difficult point in medical teaching.
妇产科临床实习是医学教学的难点。
Teaching Quality of college pedagogy has been a difficult point for years in normal colleges.
公共教育学的教学质量问题多年来一直是高师教学改革中的一个难点。
The teaching of function of several variables is a difficult point in higher mathematics teaching.
求最值问题是中等数学永恒的话题，其中，多元函数求最值是难点。
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。
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。
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