specialized search engine meaning in English

专用搜索引擎

Design of a meta - search engine based on specialized search engine
基于专业搜索引擎的元搜索引擎的设计
You can see that specialized search engine gets high precision in some field just at expense of large retrieval coverage
但是，这种专业搜索引擎是以牺牲大的覆盖面为代价而取得某范围内的高精度的。
Increase speed and special structure of web information make some difficulties in its retrieval . search engine is becoming an independent tool now after developed from simple robot search software , single search engine to specialized search engine and meta search engine since it came into being to play up to people " s requirements
搜索引擎( searchengine )应人们的迫切需求出现以后，经历了从简单的机器人搜索软件( robotsearchsoftware ) 、独立搜索引擎( singlesearchengine )到专业搜索引擎( specializedsearchengine ) 、元搜索引擎( metasearchengine )的发展历程，成为人们在web上寻找信息不可或缺的工具。