                 Keep in mind your username is visible to the public.                 This is a required field that must be unique, 150 characters or fewer.                 This value may contain only letters, numbers, and @/./+/-/_ characters.                 
                 请注意用户名将公开可见。                 这是必填字段，不能与他人重复，且须不超过 150 个字符。                 字段内容仅可包含拉丁字母、数字、@ . + - _ 等符号。                