查询扩展是优化信息检索的有效途径。
Query expansion is an effective way to optimize 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。
This paper has mainly discussed the meaning, effect and analysis tools of patent information and introduced the methods for patent information retrieval.
网络已经成为人们获取信息的重要途径，网上信息的检索变得尤为重要。
Network has become an important access to information people need, which makes image -retrieval from the Internet becomes particularly important.
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