Two-level domain name, SEO blockbuster

Already promised to write this article, has not written, is worried about this article, will cause a free space, but in order to fall behind the webmaster, not so much.
First look at Seochat's latest news about Google algorithm:
http://www.seochat.com.cn/blog/weblog.asp?blogid=1
(1) The dependency of the import link.
　
(2) The richness of the content of the page, whether for visitors to provide more information, more user experience.
(3) Google in the update of the reverse link at the same time, a change in the search results of the title display, from 22 Chinese characters to 36 Chinese characters.
And then the friends who have not read the relevant articles before read here:
The 5w1h of SEO and SEF from the view of management
http://www.im286.com/viewthread.php?tid=733777&fpage=3
SEO cheat Edge, keyword
http://www.im286.com/viewthread.php?tid=735682&fpage=3
OK, after reading we will discuss the level two domain name and SEO.
SEO what to do, but is the domain name level and keyword level. One of the key skills to promote the ranking of keywords is to use the free level two domain name, so that the rubbish becomes gold. SEO is now very popular with the free level two domain name to do the ranking, we first look at two examples.
Key words: SEO Tools
Status: Top 10
Website: wu678fei.s19.xrea.com/cgi-bin/forums.cgi?forum=3
Http://www.google.com/search?sou ... =utf-8&rls=ggld,ggld:2004-18,ggld:zh-cn&q=seo+tools

SEO Tools is undoubtedly seo circle is very hot a keyword, this is the first page of a Chinese site, with or two domain name, why?
Answer: xrea.com
Let's look at an example.
Key words: Air ticket
Rank situation: First
Website: ticketcn.51.net/
http://www.google.com/search?q=%E6%9C%BA%E7%A5%A8&btnG=%E6%90%9C%E7%B4%A2&hl=zh-CN&newwindow=1 &c2coff=1