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After introducing the connotation and background of reverse logistics, this paper analyzes and studies the macrocosm performance of reverse logistics with the comprehensive evaluation method based on extension theory.

本文在简要分析了逆向物流的内涵与产生背景后，运用可拓学的理论与方法，对逆向物流的整体绩效评价进行了分析与研究。

It started with introducing the history and content of gender mainstreaming, and then listed the related United Nations policies.

首先介绍『性别主流化』的缘起与内涵，以及联合国所提出的『性别主流化的妇女健康』政策架构。

Objects are maintainable and stable, because they didn't change, there's less chance of introducing bugs.

对象是维护和稳定，因为他们并没有改变，还有少引入错误的机会。

I always make a point of introducing myself to everyone I meet.

我总是认为有必要把自己介绍给我遇到的每一个人。

Introducing a method of using egg shells to produce a new type of nutritional agent citrate -malate calcium.

介绍了1种利用蛋壳制备新型钙营养强化剂柠檬酸-苹果酸钙的方法。

In a later state, Rembrandt completely changed the central part of the design, eliminating the centurion and introducing a mysterious man on horseback with a high hat.

在之后的一个版本中，伦勃朗完全改变了画中央的构图，百夫长被删去了，而添加了一个戴著高帽骑在马上的神秘男子。

In order to obtain the high MR value at the room temperature in a low applied magnetic field, several methods have been employed to modify the structure of the compounds, such as introducing the substituting ions or the interstitial atoms into this manganite matrix.

人们致力于通过掺杂、填隙等方法改变材料内部的结构，研究它的电磁输运性质，同时期望在较高的温度以及较小的外加磁场下得到较大的磁电阻效应。

This paper focuses on:(1) the mapping of different metadata sets, finding the relation of two metadata if their different owner_sets are described with RDF Schema;(2) the mapping of one metadata query statement onto several other metadata query statements in order to make several data providers work synchronously;(3) introducing the principle of Web services architecture, discussing why it is the best mode to integrate different systems.

本文重点研究了不同元数据标准中数据项的映射问题，提出了从两个独立的元数据集RDF Schema描述文档之间找到数据项语义对应关系的方法；通过把一个元数据检索请求映射成多种元数据标准的格式来实现对多个数字图书馆的统一检索；还介绍了Web服务架构的原理，探讨其在集成异构系统方面的优势。

After introducing the concepts of M-mapping, conform mapping and output mapping, auto update prototype theorem is justified and the whole process of auto update is formalized.

在引入了M映射，整合映射和输出映射等概念后，本文证明了自动更新原型定理，形式化了自动更新的全过程。

The first way is to ensure the kernel function to be positive definite by introducing space mapping transformation;the second way is using similar-SVR model to solve the unsolvable problem of SVR model with non-positive definite kernel function.

一是通过引入空间映射变换保证所得到的SVR的核函数是正定的；二是利用近似SVR模型解决具有非正定核的SVR模型的不可解问题。

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％。