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In this book the emphasis is on the role of the Dirac equation in the relativistic quantum mechanics of spin-1.2 particles. We cover the range from the description of a single free particle to the external field problem in quantum electrodynamics.

本书着眼于Dirac方程在1/2自旋粒子的相对论量子力学的作用，覆盖了从单个自由粒子的相对论量子力学到量子电动力学的外加场问题。

The this article first part introduced the direct sale the concept and the direct sale spread to the Chinese winding development situation, then in analysis small direct sale enterprises external environment present situation and internal capital, product, talented person and management question, finally aims at these questions and the retail trade giant to the marketing channel monopoly present situation, the union direct sale pattern uses each marketing method to give a terminal sale plan to explain, how the small direct sale enterprise should defer to the direct sale Fathom channel innovation to strive for the survival and the development.

本文第一部分介绍直销的概念和直销传入中国曲折的发展情况，然后分析中小直销企业的外部环境现状和内部资金，产品，人才和管理的问题，最后针对这些问题和零售业巨头对销售渠道的垄断的现状，结合直销的模式利用各种营销手段给出一个终端销售策略来说明，中小直销企业应如何依照直销法通过渠道创新来求生存和发展。

The calculation of initial alignment direction cosine matrix between SINS body frame and navigation reference frame is expanded into three parts:(1) the DCM between i0 frame and n frame is easily obtained via local geographical coordinates and initial alignment time;(2) by expressing SINS specific force equation in b frame and by the aid of external velocity log, the constant DCM from i(subscript 0) frame to i0 frame is achieved;(3) attitude updating using gyro samples gets the DCM between b frame and i(subscript b0) frame.

将捷联惯组坐标系与导航坐标系之间的初始对准姿态矩阵的实现分解为三步骤：(1)通过地理位置和初始对准时间求解i0系至n系的变换矩阵；(2)通过惯导比力方程变形，引入刚速仪速度辅助，求解从i(下标 b0)系至i0系的常值变换矩阵；(3)使用姿态更新算法实时计算b相对于i(下标 b0)系的变换矩阵。

At present, the wireless devices in general to bring the whole antenna, omni-directional radio antenna to the antenna axis, was "donut"-shaped radiation field; directional antenna is highly directional, in the small angle of radiation is totally outside the scope of signals ; the use of removable external antenna equipment can gain antenna, the antenna can not increase in the case of radiated power to increase communication distance.

目前的无线设备一般自带全向天线，全向天线电波以天线为轴，呈"面包圈"状向外辐射；定向天线具有极强的方向性，在小角度的辐射范围外是完全没有信号的；使用可拆卸天线的设备可以外接增益天线，可以在不增加天线辐射功率的情况下增加通讯距离。

Except disallowance from laws and external conditions,contractors should construct and complete items according to the bargain, correct the mistakes on work ,reach engineers' aim.

除法律或外界条件不允许的情况之外，承包商应严格按合同施工和竣工，并改正工作中的任何缺陷，达到工程师满意的程度。

China's disarmament decision is made out of its own will, rather than under any external pressure.

中国的裁军决策是由中国主动作出的，不是屈服于任何人的压力而被迫作出的。

Due to mounting internal and external pressures about the controversial and negative talk, even our only hope and link in USA decided to sever ties and disassociate with us.

她到处诽谤，批评与中伤CKRM和他的创办人。结果连我们在美国的遮盖和联系也最终决定与我们断绝关系与来往。

Coating Disbandment Leads Causes of External Pipeline Corrosion［J］.

油气管道腐蚀原因及主要防护措施［J］。

In this paper, a new dynamic accuracy theory is developed. It called the theory of the tracing of dynamic measuring error. The total output error is discomposed to the internal units as well as the external noises. And its modeling methods are discussed. Wavelet neural network is an important method in modern signal processes.

近年来 ，国内外不少学者致力于动态测试方法及数据处理方法的研究，取得了一定的成果，但是对动态测试误差分析方法的研究还不够成熟，不能满足现代高精度测试的要求，需要深入研究新的理论和分析方法。

It is the most important way to manage the environmental resources by government in the modern society, which is the process of internalizing external diseconomy.

在现代社会中通过政府来管理环境是最重要的方式，政府的环境管理就是将外部不经济性内部化的过程。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。