是问这句话什么意思还是要翻译?
翻译如下：Password rule:Must be 12 digits of English or numbers,and is composed of only 9 Roman numerals,and alphabet z.
或者
Password rule:Must be 12 digits composed of English alphabet from z or Roman numerals from 9.
如果问这句话什么意思,就是说密码的长度必须是6到12位,而且只能由英文字母（从a到z）或数字（从0到9）组成.
希望能帮到你^^