用户名由4-16个英文字母或数字组成（不能以数字、空格开头、不区分大小写）的翻译：User name from 4-16 English letters or numbers (cannot start with numbers, spaces, and are not case-sensitive) 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

User name from the 4-16 letters or numbers (not to numbers, spaces at the beginning, not case-sensitive)

User name from 4-16 English letters or numbers (cannot start with numbers, spaces, and are not case-sensitive)

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User name from 4 - 16 characters or digits (not in digital, whitespace is case-insensitive), beginning

User name from 4-16 English letters or numbers (cannot start with numbers, spaces, and are not case-sensitive)