http://book.sina.com.cn/105/2005/0609/23.htmlhttp://search.cn.yahoo.com/search?p=%E6%85%95%E5%AE%B9%E9%9B%AA%E6%9D%91%E4%BD%9C%E5%93%81%E4%B8%8B%E8%BD%BD&pid=209663_1006&source=ysearch_www_related&ei=UTF-8