难点

Mechanics and electrology both play dominant roles in the physics course in middle schools, but electrical concepts, more abstract than mechanical ones, are not only the difficulty of learning, but also the focus and difficulty of teaching.

物理概念是物理科学知识体系中最基本的部分，在中学物理课程中，力学和电学占据着主要地位，其中电学概念相对力学概念更抽象，是学生学习的难点，同时也是教师教学的重点和难点。

Learn…by oneself 自学如: I learn English by myself.

我自学英语。 Unit 13 疑难点一，疑点难点破解 1。

Based on the concept that land surfaces are of low polarization for reflected sunlight, a new method for simultaneously retrieval of surface albedo and aerosol optical thickness was given by using polarized radiance as well as total radiance measured by POLDER instrument.

陆地上空气溶胶的反演一直是卫星对地观测的一个难点，针对这个难点，本文提出联合利用偏振反射率和总反射率来同时提取陆地上空的大气气溶胶和地表反射率的反演方案，围绕此方案展开了以下工作

This essay has three difficulties: First, difficulty of conception foundation: how to grasp conception foundation, historical background and theory origin of positive economic paradigm and normative economic paradigm from a historical and philosophical perspective? Second, difficulty of formalization system: the viewpoints of positive economists and normative economists are very jumble, this paper tries to clear up the formers' theories, sums up and synthesizes various standpoints, and make it form systematism and standardization. Third, difficulty of combination in visual angle: combining economics and philosophy, resurvey some philosophy problems in economic research from the perspective of ontology, epistemology and methodology, thereby discover new problems, and make rigor argumentation toward it.

本文的难点：1、概念基础难点：如何从一种历史的、哲学的角度准确把握实证经济范式与规范经济范式的概念基础和变更的历史背景、理论渊源。2、形式化体系难点：实证经济学家与规范经济学家的观点非常混杂，本文试图理清前人的思路，总结和综合纷繁不一的观点，并使其体系化、规范化。3、视角结合点难点：将经济学与哲学有机地结合起来，从本体论、认识论、方法论的角度重新看待经济学研究中的一些哲学问题，从而发现新问题，并对其进行严密论证。

The adjustment of spectrometer is a difficult problem to the students in their experiments.

分光仪的调节是学生实验中的一个难点，该文在分析出现难点原因的基础上介绍了一种快速调节分光仪的方法——扫描法

Now, because the means of data administration is very poor and some other reasons, the market data approach is scarcely used by land valuator. In this paper, the author analyzes the application actuality and difficulties of the market data approach, and try to overcome these difficulties. Then the author accomplishes applied geographical information system for the market data approach based on urban land grading and evaluation system, taking Nantong city as example, and has got anticipative purpose.

本研究在分析市场比较法应用状况、应用难点的基础上，提出了市场比较法应用过程中难点问题的解决方法，从技术角度上阐述了基于城镇土地定级估价信息系统之上的市场比较法评估信息系统的建立，尤其是以南通市为例完成了该市市场比较法信息系统和各项基础数据库的建设，取得了预期的研究成果。

Abond, one of the top Chinese climbers, came out with us and did a brilliant 13a and Chris attempted a very long 13d onsight with a heartbreaking crux at the very end- which did just that to Chris.

阿邦，中国顶尖的攀岩者之一，陪同我们出来，并完成了一条漂亮的 13A。而Chris尝试onsight一条很长的13D，在线路结束部分有一个让人崩溃的难点。正是这个难点让Chris的onsight尝试失败了。

The major types of finite subordinate clause are relative clause, adverbial clause and nominal clause.The major types of non—finite subordinate clause are infinitive clause,—ing participle clause and —ed participle clause and verbless clause.

非限定从属分句的形式有不定式分句，以—ing 结尾的分词分句，以—ed 结尾的分词分句和无动词分句 Chapter 12 Relative Clause 关系分句 31 难点，一，难点，重点 1。

In headstock design in the main axle distribution and the jig design clamp design is this design difficulty, emphatically will solve the difficult problem in the design process.

其中主轴箱设计中主轴的分布和夹具设计中的夹紧装置设计是设计的难点，在设计过程中将着重解决难点问题。

China Water Conservancy and Hydropower 3rd Engineering BureauLanzhouGansu730010The intake tower is located in the traffic bridge on the left bank power station Gongboxia imports spillway tunnel, bridges with a rib plate for the T-beam, long 20m, bridge steel welded joints has become one of the difficulties of the installation: space narrow, steel-intensive, welding operation difficulties.

进水塔交通桥位于公伯峡电站左岸泄洪洞进口，桥梁为带有肋板的T型梁，长20m，桥梁钢筋接头的焊接成为安装的难点之一进水塔交通桥位于公伯峡电站左岸泄洪洞进口，桥梁为带有肋板的T型梁，长20m，桥梁钢筋接头的焊接成为安装的难点之一：空间狭窄、钢筋密集、焊接操作困难。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。