Part of an account name is defined as three or more consecutive alphanumeric characters delimited on both ends by white space such as space , tab , and return , or any of the following characters : comma , period , hyphen , underscore , or number sign 部分帐户名是指三个或三个以上两端用“空白” (空格、制表符、回车符等)或任何以下字符分隔的连续字母数字字符:逗号( , ) 、句点( . ) 、连字符( - ) 、下划线( _ )或数字符号( # ) 。