用户名；用于识别个人计算机系统用户身份的姓名或字符串。
用户名；用于识别个人计算机系统用户身份的姓名或字符串。
用户名；用于识别个人计算机系统用户身份的姓名或字符串。
A name or string of characters used as a person's identification on an individual computer system.
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