Code the last three digits 验证码最后三位数
Cluster member number (last three digits).
(最后三位数)。
Seven lowercase and alphanumeric characters, first four characters being alphabetic and the last three characters being digits.
七个小写字母和字母数字字符，前四个字符为字母，而后三个字符为数字。
Seven lowercase and alphanumeric characters, first three characters being alphabetic and the last four characters being digits.
七个小写字母和字母数字字符，前三个字符为字母，而后四个字符为数字。
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