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Because the concept of course is abstract and it demands good space imagination, teaching is difficult.

该课程涉及概念比较抽象，对空间想象能力要求较高，教学难度较大。

Because the concept of field is abstract and it demands good space imagination, the students always feel it s difficult.

由于场的概念比较抽象，对学生空间想象力要求较高，学生普遍感觉本课程较难。

It is very difficult to understand compiling algorithms because of their abstractness.

由于编译原理的算法比较抽象，要理解它们很难。

This article will take the JianZheng's representative prose for example to analysis the work itself imagination, affectedly unconventional abstrusely and difficult to understand and so on. And this article will analysis the reason about these performance. At the same time, it will attempt to seek in the JianZheng's work in estimating the in-depth and more valuable things.

本文将以简媜代表性的作品为例，从作品本身的想象、矫情、深奥等方面进行分析，并就这些表现的产生的原因进行剖析，试图在揣摩中探求简媜作品中更深层的东西。

It is possible to do some almost absurdly difficult-to-understand things with regular expression (but ones that are nonetheless useful).

这是有可能做一些荒唐几乎很难理解的事情经常表达but的仍然是有用的）。

Wang Luyan has found his root in the life difficult position of mutual repellence and reliance of Chinese culture, the front and rear,, the absurdness in the progress turning into specific operation has given us alarm we have created some value and set a trap for ourselves.

王鲁炎更是深深扎根于中国文化的互斥互倚、前与后等等生命困境而转化为具体的操作过程的悖谬，警示着我们创造了某种价值，同时也为我们设置了陷阱。

Humans have learned the same energetic abusiveness as their Pleiadian ancestors, making it difficult to spend time in groups as a result, and in particular if one is sensitive.

人类已经象他们的昴宿星人祖先一样学会了同样的能量滥用，如果你很敏感，那你会觉得在人群之中很难度日。

After a serial of precise analysis, a conclusion can be made that this measure can detect the attacking actions of network and abusiveness of users right. However, with the inherent calculating complexity of statistic measures , it is difficult to detect network accessing instantaneously.

该方法可以很好的检测出网络中的攻击行为以及用户权限滥用行为，但由于统计方法固有的计算复杂性，并不利于网络访问的实时检测。

In our country, this is still the difficult problem that academia debates endlessly.

在我国，这仍是一个学术界争论不休的难题。

How to avoid joint hypothesis is difficult problem of academia for long time.

如何回避联合检验，是金融学术界极为关注的问题之一。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。