如果一个用户忘记了他的用户名，你可以通过询问他的电子邮件地址作为参数传递给GetUserNameByEmail方法获得这个用户名并告知用户，但是这并不安全。
If a user forgets his user name, you can remind him by asking for an E-mail address and passing it to GetUserNameByEmail but that's not a secure option.
忘记你的用户名？
你有一个“奔达”账口但是你忘记你的用户名称或密码。
You have an account with Brand ID but you have forgotten your username and or password.
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