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http://www.eyjx.com/eyjx/1/ReadNews.asp?NewsID=2845 8/3/1014 http://www.zhixing123.cn/lilun/1639.html 3/3/2014 http://teacher.eol.cn/mian_shi_ji_qiao_8103/20140115/t20140115_1064908.shtml 3/3/2014 http://3y.uu456.com/bp-a308b78d84868762caaeds72-1.html 3/3/2014 http://scpx.cersp.com/article/browse/155498.jspx 6/3/2014 http://www.fed.cuhk.edu.hk/~hkier/content/document/OP/SOP43.pdf 1/3/2014