The primary goal of the spammers is to increase the search engine ranking for their client sites, in a process called "black hat search engine optimization (SEO)" or "Spamdexing".
垃圾信息散布者的主要目的就是提高其客户站点在搜索引擎的排名，这个过程被称为 “黑帽式搜索引擎优化（SEO）” 或 “垃圾索引”。
SEO impact: Choosing a primary domain will help avoid duplicate content.
对搜索引擎优化的影响：选择一个主域名将有助于避免重复内容。
Content to have primary and secondary key. SEO why of the articles are in bold text with, this is the objective.
内容要有主次重点。SEO十万个为什么的文章都带有黑体文字，就是这个目的。
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