Surface Web（表层网）或可称为Visible Web（可见网）是指由 以超链接可以到达的静态网页构成的，通过超链接可被传统搜索引擎索引到的Web 页面。
基于68个网页-相关网页
The Deep Web is opposite to the Surface Web. As the Internet continues to expand and deepen,more and more information are available to people through the way which unifies the dynamic homepage technology and the database technology.
深网是相对于表层网而言的,随着互联网信息的不断扩充和加深,越来越多的信息资源通过动态网页技术与数据库技术相结合的方式提供给人们。
参考来源 - 深网查询接口判定技术的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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.
第一，表层要选择棉网面的。
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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