Usernames cannot be changed once set. Usernames should be alphanumeric without spaces. To referrers, your Referrer Key will be generated by using your username. ( 用户名一旦设置了就无法更改。用户名应为字母数字，不能有空格。对于推荐人，您的推荐人密钥将使用您的用户名生成。 )
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