Nowadays , the network information search tools are mainly of two kinds : list - based search engines and words - based search engines 目前，网络信息检索工具主要是基于范畴层次( list - basedsearchengines )的搜索引擎和基于语词层次( words - basedsearchengines )的搜索引擎。
Through the experiences and skills obtained in the retrieval practices , this paper introduces the retrieval functions of the search engine and the characteristics , usages and retrieval methods of the retrieval tools for the network information , in the light of the characteristics of network news , points out several methods and approaches for seaching the important web sites 通过检索实践得到的经验和技巧,介绍了搜索引擎的检索功能和网络信息检索工具的特点、使用方法,并针对网络新闻的特点,指出了几种查找重要站点的方法和途径。
The meanings of this paper lie in the development and research of chinese libraries and chinese archives by through the theoretical research on xmarc . it will produce the marked effect for xmarc concentration information to be researched and practiced . the new solving schema of theme classification and the subject indexing of chinese information has been explored through excavating xmarc theme information voluntarily 论文工作的意义在于通过对xmarc的理论研究，将我国图书、档案学科领域元数据的研究引向深入，探索国内外marc元数据集中信息描述的机制，这些研究取得了极有价值的实践成果;通过自动发掘xmarc主题信息，为中文信息的主题标引、主题分类和主题检索自动化探索出新的解决方案，从而增强我国网络信息检索工具的实用性和提高信息检索的质量。
The author wants to look forward to the latest trend of development in this field by studying the theoretic and practical achievement in information retrieval language both at home and abroad in the time of internet . this paper is made up of five parts . the first part analyses the effects of information retrieval language in network condition ; the second part introduces the achievements in electronic traditional classification and the using of traditional classification in network and in information retrieval tool ; the third part introduces the achievements in electronic traditional subject and the using of traditional subject in network and in information retrieval tool ; the forth part is about natural language processing and natural language retrieval which includes basic principles of natural language processing and the using of information retrieval ; finally , the author points out that the new development of information retrieval language includes metadata and the integration of the classification - subject - natural language 本文主要研究网络环境下信息检索语言的发展，主要内容包括五部分：第一部分分析了网络环境对信息检索语言的影响；第二部分是网络环境下分类检索语言的应用，包括传统分类法电子化及在网络上的应用，网络信息检索工具中的应用；第三部分是网络环境下主题检索语言的应用，包括传统叙词表电子化及在网络上的应用，在网络信息检索工具中的应用；第四部分是自然语言处理与自然语言检索，包括自然语言处理的基本原理及在信息检索中的应用，国内外自然语言检索进展；作者在论文最后指出，在网络环境下信息检索语言新发展有：元数据研究；分类-主题-自然语言一体化，分析国外一体化系统实例：一体化医学语言系统umls ，国内一体化系统实例： 《中国财经报刊数据库》检索系统；并指出学科?事物概念组配型检索语言是理想发展模式。
Some famous browse network information search tools , such as yahoo , excite , galaxy and most comprehensive search tools actually draw lessons from the idea of organizing and revealing information by traditional information retrieval language consciously or unconsciously . for example , askjeeves is a kind of nature language search engines 著名的浏览型网络信息检索工具如yahoo 、 eblast 、 galaxy和大部分综合型搜索引擎实际上都是自觉或不自觉地借鉴了传统情报检索语言组织和揭示信息的思想， altavista集成的askjeeves就是自然语言搜索引擎。
Network information service is a new growth area of digital time information service , but it is facing the obstacle from the aspects of information users , information source , document communication system , network information searching tool and the problems of information institution itself 摘要网络信息服务是数字时代信息服务新的增长点，然而开展网络信息服务却受到来自信息用户方面、信息源方面、文献传播系统方面、网络信息检索工具方面以及来自各种信息机构自身方面的障碍。
In the last part , the author analyzes the types and principles of www , a hyper - text information retrieving tool , and sums up the characteristics of some search engines most in use by means of tables . taking google as an example , the author also looks forward to the future of the developing trend of search engines 最后，论文对超文本信息检索工具? ? www的类型、工作原理进行分析，以列表方式对一些常用搜索引擎的特征进行总结，并选取www上新一代搜索引擎google为典型代表，进行实例说明，展望了下一代搜索引擎的未来发展趋势。
Search engines , serving as the retrieval tool of internet information , are facing extreme challenge . this thesis focuses on the profound research of the crucial technology concerning with the intelligent information retrieval tools , and theoretically puts the emphasis on the research about the problems and their resolvings that have to be confronted during the development of the new generation of information retrieval system 作为web上的信息检索工具?搜索引擎也面临着极大的挑战，本文主要就这一智能信息检索工具所涉及的关键技术进行了深入研究，重点从理论上研究了开发新一代的信息检索系统所面临的问题及解决方案。
