Each type of user requires specific persistent information to be maintained, and there is persistent information (such as user ID and password) that's required for all users.
每种类型的用户都会要求维护特定的持久性信息，还有一些所有的用户都要求维护的持久性信息(比如用户标识和密码)。
Each type of user requires specific persistent information to be maintained, and there is persistent information (such as user ID and password) that's required for all users.
每种类型的用户都会要求维护特定的持久性信息，还有一些所有的用户都要求维护的持久性信息(比如用户标识和密码)。
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