必须有一种机制能够支持惟一的用户标识和身份验证。
There must be a mechanism in place to support unique user identification and authentication.
站点要求他提供注册信息：一个惟一的用户ID和密码。
He is asked to provide registration information: a unique user id and password.
在注册期间，要求玩家提供惟一的用户ID和相关的密码。
During registration, you ask the gamer to provide a unique user id and associated password.
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