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There are some space can not set two domain name, if you want to set the level two domain name is for money, so can only do two level directory.
What is the level two directory: Level two directory is the main station subdirectory, equivalent to the root of the site to create folders to store separate sections of the content, and these folders are level two directory, two level directory must be stored in these documents index.html, Index.htm, index.php, Index.asp, Default.html, Default.htm, Default.asp, default.php, such as the home page, this is the true meaning of the level two directory, and only these default home page can inherit weight.
The benefits of the secondary directory: the level two directory will inherit the weight of the first page. If you have a high weight on the home page, then the level two directory will also have a good ranking, using the level two directory to do a page did not do the keyword ranking is also a good choice. Of course, in line with the user needs of the content to do is the most important, do not randomly add level two directory. An appropriate number of level two catalogs can be added as the weight of the homepage.
The use of the second level of the directory (here is my Emmy hot drilling network to do the explanation): My site is divided into four sections (forum/bbs, hot map hot drilling/design, physical display/physical, laser burning flowers/decorated_fire), I have set up a folder for each section to store the contents of the forum separately, And each folder has index.html home page, this page must make good use of, especially the title of the description, such as you want to do too many keywords, and the home page, you can consider using the title of these pages to do the homepage do not finish the keyword.
To see the title description can go to my website to see, here I will not say.
Source: Ai Mei Hot map Hot Drilling Network http://www.aimeis.cc