The twist in the tale is as follows: a second controller process exists in the system that can send a suspend operation signal to your device over a dedicated channel.
这个故事中介绍的方法是这样的：系统中存在着第二个控制器进程，它能通过专用通道向设备发送suspend operation信号。
It enforces an authorization process that may limit the end user on the amount of records it can view after the controller level transaction is called.
它实施一个授权过程。在调用控制器级事务之后，这可能限制终端用户可查看的记录数量。
Filters can be used to pre- and post-process controller methods.
过滤器可用于提前或推迟处理控制器方法。
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