Some sites need higher keyword density -- pages optimized for very competitive keywords may need more quality links to achieve the traffic you need to make money online.
有些网站需要更高的关键字密度-为非常有竞争力的关键字做网页优化会需要更多的高质量的链接，这才有你在线赚钱的所需流量。
Density is important; i.e. 2 keywords for every 5 words counts more than 2 for every 15.
密度很重要，比如每五个词中有两个关键词比每十五个词中两个关键词要有效。
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