http://www.yotor.com/wiki/zh/%B0%A2/%B0%A2%C0%AD%B2%AE%D7%D6%C4%B8%B1%ED.htmhttp://www.yotor.com/wiki/zh/%B0%A2/%B0%A2%C0%AD%B2%AE%D7%D6%C4%B8%B1%ED.htmhttp://necweb.neu.edu.cn/ncourse/gltj/gltj/zimubiao/xlzmb.htm