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Based on the chain rule techniques, AD seeks first or higher order derivatives of functions represented by a group of dependent program procedures and extended files, the so-called original model, through a number of code-to-code transformings under a series of differential rules.

基于链式求导法则的自动微分方法通过改写原程序模式代码，依赖机器自动构造不同的微分模式，来分析求解函数的一阶或高阶导数，即在一系列预定微分规则下对不同程序对象做从代码到代码的自动微分转换。

Business electronic commerce covers include: exchange of information, pre-market after-sale (for products and services details, the use of technology products guides, answering customer opinion), marketing, electronic payment (using electronic funds transfer, credit cards, electronic chouse, and electronic cash), transport, the gradual virtual enterprises (formation of a physical, non-existent enterprises. Concentrate a number of small independent companies' competence than any single company to provide more and more products and services), companies and trading partners can share jointly owned and operated business methods, etc. In short, e-commerce is the use of existing computer hardware, software and network infrastructure. The agreement will connect through electronic network environment for a variety of business activities.

电子商务涵盖的业务包括：信息交换、售前售后服务（提供产品和服务的细节、产品使用技术指南、回答顾客意见）、销售、电子支付（使用电子资金转帐、信用卡、电子支票、电子现金）、运输、逐渐虚拟企业（组建一个物理上不存在的企业，集中一批独立的中小公司的权限，提供比任何单独公司多的多的产品和服务）、公司和贸易伙伴可以共同拥有和运营共享的商业方法等等总而言之，电子商务是利用现有的计算机硬件设备、软件和网络基础设施，通过一定的协议连接起来的电子网络环境进行各种各样商务活动的方式。

In an effort to elucidate the mechanisms of the resistance,our laboratory has previously identified and reported a number of genes associated with resistance to a widely used pyrethroid deltamethrin,including a Culex chymotrypsin gene.

为阐明媒介昆虫对拟除虫菊酯的抗性机制，本实验室先前已经鉴别并报道了一系列拟除虫菊酯代表种溴氰菊酯抗性相关基因，其中包括糜蛋白酶基因。

200 Years, a number of historians have described as a "city-state" a small country.

一、二百年内，陆续出现了一批史家称为"城邦"的小国。

It is learned that China's commercial real estate development there are still a number of shortcomings, one of which is the development of the concept of the blind, and some commercial real estate development companies inaccurate positioning of the project, the development of the commercial format is not clear, there is no sequence, such as investment management plan, which led to the development of real estate projects follow-up can not keep up; Second, the existing part of the commercial real estate development enterprises are engaged in housing construction origin, the former in order to sell an end in itself, is an obvious short-term business; while the latter is obtained through the lease operators for the purpose of long-term returns, the differences between the two was not by a clear understanding of corporate decision-makers, at the same time affected the design and planning until the latter part of the management and many other links.

据了解，中国的商业房地产的发展仍然存在着一些缺点，其中之一是发展的概念的盲人，和一些商业性房地产开发公司的定位不准确的项目，发展商业形式目前尚不清楚，也没有序列，如投资管理计划，这导致房地产开发项目的后续行动跟不上，二是现有的部分商业房地产开发企业从事住宅建设出身，前者以销售本身就是一个目标，是一个明显的短期业务；而后者则是通过租赁运营商的目的是长期回报，两国之间的分歧不是由一个清楚地了解企业的决策者，同时影响了设计和规划直至后期的管理和许多其它联系。

In addition when a handler is actively training his dog he has a number of things to do with his hands besides holding a clicker.

另外，当训犬者活跃的进行训练时，他的手可以做许多事，而不仅仅是拿着响片。

Zhang Bing filter head from the filter and filter-the first component, the overall injection from its main features is the first filter for Taiwan hollow circular shape, the first by the filter at the top, strip-joints, vertical plate, horizontal plate, filter The first floor composed of horizontal and vertical plate plate symmetrical side of the first set in the filter, filter them by the side of the first formation of a number of strip-joints; par for the hollow tubular filter, filter and the filter rod first floor Phase grounding Department of thread, filter and the filter head-intracavity Intracavity the same, in the filter at a lower open air intake and intake slit, the filter is not closed at the bottom of the same with the outside world.

该长柄滤头由滤头和滤杆组成，整体注塑而成，其主要特点是滤头为中空圆台体形，由滤头顶部、条形孔缝、竖向导流板、横向导流板、滤头底板组成，竖向导流板和横向导流板对称设置在滤头侧面，并由它们在滤头侧面形成若干条形孔缝；滤杆为中空管状，滤杆上与滤头底板相接处有外螺纹，滤杆内腔与滤头内腔相通，滤杆中下部开有进气孔和进气缝，滤杆底部不封闭与外界相通。

Our company was founded in October 2005, in 2005, successfully developed a new generation of coin-operated washing machines, and from Japan to introduce a number of advanced technological equipment devoted to research, to provide users with high-quality products have laid a solid foundation.

我公司创建于2005年10月份，于2005年成功研发出新一代投币式洗衣机，并从日本引进一批先进的科技设备投入科研部，为向用户提供高品质的产品奠定了坚实的基础。

This paper introduces the research results of techniques of testing PC pump oil well through one-year efforts. Which covers the mathematical models of a number of force characteristics strength analysis, and resonance critical problems of rotation rod-string in PC pump wells: resulting of testing method of polish-rod load and rotation rate on the basis of feasible demonstration and technical requirement analysis; study and manufacture of system of testing PC pump well, which involves sensor, collector ring, acquisition circuit and computer; research and determination of assistant technology of testing force on rotation polish-rod and formulation of testing force on polish-rod. A spot testing has been carried out by means of the above research fruit and good results have been achieved.The success testing results in has laid a strong foundation for the oil well diagnosis.

本论文介绍了对螺杆泵采油井的研究成果，其内容包括，对螺杆泵采油井中的旋转杆柱的若干受力特征、强度分析方法及共振临界问题进行数学建模；在可行性论证和技术需求分析的基础上，研究产生了对油井进行光杆负载和旋转速度测试的办法；研究制作了螺杆泵采油井测试系统，它包括传感器、集流环、采集电路和计算机等；研究确定了对实施旋转光杆测力的辅助工艺；制定了对光杆受力进行测试作法，利用以上研究成果实施了现场测试，并取得了理想的结果。

In the nineteenth century a number of Native American tribe, such as the Comanche, A B lived a nomadic existence hunting buffalo.

改正：tribe tribes 翻译参考：19世纪的很多北美的部落里，例如科曼奇族，过着一种以打猎美洲野牛为生的游牧生活。

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％。