求专业翻译人员．我在线等，不要机翻的．

The article on the origins and search engine development and engine components and classification. Through the search engine and the principles of classification, in-depth analysis of the various search engines principle, characteristics and advantages and disadvantages. At present many of the search engine will Keywords are indexed and themes directory combine to give full play to the advantages of both. And with technological advances, the engine is also developing rapidly, its comprehensive aptitude from the direction of professional development, to diversify from a single direction, from English to mainly develop in the direction of multi-language, but also from other different classification Promote their sound development. The article also outlined the development of search engines and the mode of development, and through the current search engine used by a variety of ways to search classified analysis; again on the search engine on the basis of summing up the status quo, the