本文通过对目前常用的信息检索工具进行分类。
Based on current information retrieval tool commonly used to classify.
搜索引擎系统作为互联网信息检索工具，其使用率变得越来越高。
Search engine system, as an Internet information retrieval tool, of which the utilization rate is getting higher and higher.
可分为：手工文献信息检索工具和计算机信息检索工具两大类型。
Can be divided into: hand literature information retrieval tools and computer information retrieval tool for the two types.
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