专门、专业网络检索工具研究

网络信息资源的迅猛增长 ,使人们获得有用信息越来越困难 ,网络检索工具应运而生 ,文章简要分析了搜索引擎的局限 ,介绍了几种常用专业网络检索工具的基本情况及检索方式 。

The quick increase of net information makes it more and more difficult for people to get useful information.Net search tools emerged as the times require.The paper analyses search engines' limitation briefly,introduces several professional net search tools' basic situations and searching ways,and at last raises professional search tools' developing countermeasures.