In face of network environment, Information retrieval also faces many new problems.
情报检索面临网络化环境，也就意味着面临许多的课题。
Deep Web; Network information resource; information retrieval; U. S. a.
深网；网络信息资源；信息检索；美国。
Search engine becomes the most popular network service of information retrieval.
搜索引擎是通用的信息检索服务。
Search engine becomes the most popular network service of information retrieval.
搜索引擎是通用的信息检索服务。
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