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http://blog.donews.com/tianshun/archive/2013/07/
http://wenku.baidu.com/view/e5a736e3e53a580217fcfe18.html?re=view&from_page=view&from_mod=download
http://strawren.iteye.com/blog/241090
http://www.zhihu.com/people/tian-shun/topic/19575436/answers
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原文地址：http://www.cnblogs.com/taowen/p/4937776.html
