In the past man take traditional information retrieval methods, such as card retrieval tools, film tools and CD-ROM retrieval.

过去人们主要采用传统的信息检索方法，如：卡片式检索工具、微缩制品、光盘制品等。

youdao

This paper has mainly discussed the meaning, effect and analysis tools of patent information and introduced the methods for patent information retrieval.

本文论述了专利信息的内涵、专利信息的作用及专利信息的分析工具，介绍了专利信息检索的途径。

youdao

The characters of its information resources, retrieval methods and results are fully introduced and the function is briefly commented on this paper.

本文详尽地介绍了它的信息资源、检索方法及结果显示等特点，并对其功能作了简要评述。

youdao