The deep web content is estimated at 500 times that of the surface web, 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 surface Web, these programs have a harder time penetrating databases that are set up to respond to typed queries.

虽然这种做法对网络表层的网页行之有效，但这些自动搜寻程序难以穿透数据库，因为数据库是设置为应对输入型查询的。

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While that approach works well for the pages that make up the surface Web, these programs have a harder time penetrating databases that are set up to respond to typed queries.

虽然这种做法对网络表层的网页行之有效，但这些自动搜寻程序难以穿透数据库，因为数据库是设置为应对输入型查询的。

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