默认情况下，用户将在受限制的语法模型下进行操作，因此支持迁移。
By default, users will operate in restricted grammar mode thus supporting migration.
它负责生成当用户试图访问受限制的操作时显示的登录表单。
It is responsible for generating the login form that users will see when they try to access a restricted action.
为了成为bob的好友，Alice首先得发送一个消息给fanout交换器iends，我们假设这个交换器是访问受限24的：普通用户不能够将队列绑定到它。
To become friends with a user Bob, user Alice sends a message to the fanout exchange iends. We assume that this exchange is somehow access restricted 24: ordinary users cannot bind queues to it.
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