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Chapter four (application of chaos in measurement field): In this chapter firstly the sensitivity of initial values and parameters that chaos can be used in the measurement field has been analyzed quantitatively, on this basis, the necessary conditions of chaotic system that can be used in measurement are concluded and presented; then the mechanism of measurement implemented by subsection linear map chaotic system, the coordinating relationship between chaotic output signal and the values being measured , and the precision of system measurement are further analyzed quantitatively . And a chaotic voltage measurement system using DSP is designed. Secondly a basic thought that thesensitivity of chaotic parameters can be used in measurement is presented and simulated. Its theoretical testing circuits are designed.

第四章(混沌在测量领域中的应用)首先对混沌可用于测量领域的初值敏性和参数敏感性进行了定性分析，在此基础上，归纳并提出了可用于测量的混沌系统应具有的必要条件；定量地分析了分段线性映射混沌系统实现信号测量的基本原理、输出混沌序列与被测量间的数值对应关系及系统的测量精度等问题；并以DSP为核心设计了混沌型电压测量系统；其次提出了混沌参数敏感性用于测量的基本思路，并对此进行了计算机仿真及原理性实验电路设计。

By means of symmetries, we give a sufficient and necessary condition of general linearization.

利用对称性给出了非线性系统一般线性化的充要条件。

Necessary and sufficient conditions for state feedback linearization of a class of nonlinear discrete-time systems is presented.

4给出并证明了一类多输入非线性离散系统状态反馈线性化的充要条件。

For China's socio-economic sustainable development, it is necessary to change traditional linearly economic development mode and take the way of environmental harmonious development.

改变传统的线性经济发展模式，走与环境和谐发展的道路是实现我国经济社会持续发展的必然选择。

In order to reflect linguistic changes, it is necessary for the publishing of new dictionaries.

为了反映语言的变化，新的词典的出现是必要的。

Both linguistically and culturally, the study of Tancheng dialect is very necessary and significant.

无论从语言研究的角度还是从文化传承的角度来看，对郯城方言的研究都是非常必要和有意义的。

However,in contemporary society in which people are linguistically harmonious and have more deepened communication,it is not always necessary for each minor nationality to create its own writing.

文字的产生和发展与民族社会的历史和文化密切相关，历史经验表明，一个有文字的民族就有发达的科学文化和高度发展的社会。

Therefore, it's very necessary to strengthen lyric study from the linguistics' point of view.

因此，从语言学的角度加强对歌词的研究是非常必要的。

Today, we are at the point of questioning whether linguistics is a necessary part of translation.

今天，我们在点质疑语言学是一个必要组成部分的翻译。

A shipping company, it is necessary to link the Group System to a plan of finance

个完整的运行预算，要求必须与分组系统的财务数据相连接。

London based fashion photographer Matt Irwin might be is the next big thing in fashion photography.

总部位于伦敦的时装摄影师马特欧文可能会是下一件大事的时装摄影。

Based on IMC system,the response would be better if the model matched more satisfactorily.

由于系统基于内模控制设计，故模型匹配度越高，系统响应越好。