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http://pan.baidu.com/share/link?shareid=684443347&uk=3811896366

http://blog.sina.com.cn/s/blog_8442ec3b0100xi81.html

http://blog.csdn.net/sunshinezff/article/details/44259641

http://www.cnblogs.com/goodness/archive/2010/03/05/1678924.html