因为搜索引擎的检索数目常常被用作并不存在的相关性指数的替代者。
This is because search engine size has long been used as a substitute for a relevancy metric that doesn't exist.
在进行文献检索特别是多关键词文献检索时，现有科学搜索引擎的检索结果排序存在一些问题。
While conducting literature retrieval, especially multi-Keyword literature retrieval, there are some problems on ranking the retrieval result of current scientific search engine.
分析了搜索引擎在查全率与查准率方面存在的局限性，提出了提高搜索引擎检索准确率的策略。
This paper analyzes the limitation of search engines in the recall and precision, and advances some tactics for increasing the retrieval precision of search engines.
但与通用全文搜索引擎类似，全文检索的垂直搜索引擎存在着查全率较低、网络资源消耗过多等问题。
Conforming to the universal full-text search engine, it is also confronted with the problem of low-recall ratio and high dissipation of web resource.
然而，由于目前搜索引擎自身的局限性，使用关键字检索到的结果，仍然存在垃圾信息而造成时间和空间上的浪费。
However search engine has its own location, the result exists useless information because of using keywords searching, so resulting in wasting time and space.
然而，由于目前搜索引擎自身的局限性，使用关键字检索到的结果，仍然存在垃圾信息而造成时间和空间上的浪费。
However search engine has its own location, the result exists useless information because of using keywords searching, so resulting in wasting time and space.
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