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//csubstr()中文字符截取函数(无半个汉字)
//作者:ylx(wanxiangyu@163.com)
//最后修正于:2000-12-19
//updated by ylx at 2001-7-31 12:30
//updated by ylx at 2001-9-10 15:06,find a error,so fix it.
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