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。

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.

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第一，表层要选择棉网面的。

Firstly, choose cotton net surface.

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滤叶就是滤网，形似叶片，故称滤叶。外表层用特殊结构的细滤网精制而成，中间夹有支承网。

Strcture:filter mesh is called filter vance because of its vanceshape, with the spacial structure thin filter mesh outside and the supporting mesh inside.

youdao

滤叶就是滤网，形似叶片，故称滤叶。外表层用特殊结构的细滤网精制而成，中间夹有支承网。

Strcture:filter mesh is called filter vance because of its vanceshape, with the spacial structure thin filter mesh outside and the supporting mesh inside.

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