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It can reflect the separability better than the criterion based on within-class and among-class distance,and has better geometric meaning.

这种判据优点是计算简单；不足是当类间距离较小、类内距离较大时，此判据仍有可能取得较大的值，而此时的

Rule-based and reusebased method is adapted in our system to develop applications. Rules are used to define geometric representation of geographic objects, spatial relationships among geographic objects and map design rules. Reusability is realized through object's inheritance and encapsulation. The basic function related to GIS has been implemented in OOGDB's basic class base. Application related function can be implemented in sub-classes of basic classes and some of basic class' function can even be overloaded.

GIS应用系统的开发采用基于规则和基于重用的方法进行，规则用于定义地理对象的几何表示和空间关系以及地图构造的规则等，重用是通过面向对象的继承和封装机制实现的，GIS实现了一个基本的类库，它完成基本的空间处理和操作，用户通过定义这些类的子类重用类库提供的功能，并增加与应用系统有关的特殊功能，用户甚至可以通过重载修改某些类库的功能。

With the development of information technique, Amount of operation data present geometric series increase in industry inside and among of industry.

中文摘要：随着信息化技术的不断发展，行业内部和行业间的业务数据量呈几何级数递增，海量数据的传输与处理难题成为制约信息化产业扩大的瓶颈，本文研究了Sybase的MobiLink技术，并以MobiLink技术为基础，完成了分布式海量数据并行传输消息中间件系统的设计与实现。

Second, an analysis and contrast is made among several structures appearing in the market, one of which is chosen to be the initial model of the system and the need of initial parameters is calculated based on relevant geometrical optics.

然后对市场上现有的几种结构进行分析对比，选取其中一种作为设计的初始模型，利用相关光学知识计算初始设计参数。

Why dirt?Some soils are surprisingly rich in minerals and nutrients such as iron and copper. People can often get more of these nutrients from geophagy than from taking vitamin supplements. This may be why geophagists often claim to like the "sour taste" of dirt and to have cravings for it. It may also explain why geophagy is often most common among pregnant women and nursing mothers.

干嘛吃土？有些土壤出人意外地富含矿物质和铁、铜等养分，和服用维他命相比，人们藉由吃土常能摄取更多这类养分，也许这就是吃土的人常说喜欢泥土那股「酸味」并特别喜欢那种味道的原因，这也或可解释吃土习惯为何在孕妇和哺乳的母亲身上通常最为常见。

Even Democrat George McGovern, who had the lowest level of party support among recent nominees, was backed in 1972 by nearly 60 percent of his party's voters.

甚至于民主党的乔治·麦戈文，他在近期的提名人中所得到的党派支持是最低的，也于1972年时获得了他的党将近团％的选民的支持。

Even Democrat George McGovern,who had the lowest level of party support among recent nominees,was backed in 1972 by nearly 60 percent of his party's voters.

即使是近年在各党提名人中获得支持率最低的民主党候选人乔治麦戈文，在 1972 年仍然得到本党几乎 60%的投票人的拥护。

Even Democrat George McGovern, who had the lowest level of party support among recent nominees, was backed in 1972 by nearly 60 percent of his party'svoters.

即使是来拥有最低水平党派支持的民主人乔治·麦戈尔，在1972年仍得到了近60％本党派投票人的支持。

Even Democrat George McGovern , who had the lowst level of party support among recent nominees, was backed in 1972 by nearly 60 percent of his patrys voters.

即使是近年来在各党提名人中获得最低票数支持的民主党人乔治。麦哥文，在1972年仍得到了近60％的本党派投票人的支持。

I didn't expect it here, among brick Georgian terraces with their restrained style.

我原本不期望它在众多的拥有限制风格的乔治五世的一排房屋里面。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。