The deep web content is estimated at 500 times that of the surfaceweb, yet has remained mostly untapped due to the limitations of traditional search engines.
估计深网的容量约为表层网的的500倍,由于受到传统搜索引擎的限制,大部分深网的内容有待开发。
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While that approach works well for the pages that make up the surfaceWeb, these programs have a harder time penetrating databases that are set up to respond to typed queries.