模拟邮箱系统。要输入用户名和密码，直到合格或三次 调用 ggets 可以中途 ESC 退出 返回: 成功:OK 失败:ERROR.可以创建新用户。fw :写信模块　　you :发送机名　　youfile :对应文件 str1 :信件内容 str :单位字符 w :频率 hc :转换编码,由赫夫曼树获得　　strwork1:信件前导信息　　strwork2:正式编码-simulated mail system. To enter a user name and password, or until three qualified ggets can call from halfway to the ESC : Success : OK failed : ERROR. You can create new users. Fw : module you write : Send machines were youfile : str1 corresponding documents : letter str : flat characters w : frequency hc : transcoding from the Huffman tree was strwork1 : Information strwork2 letter Spotlight : official coding