当代理变成闲置代理时，它仍然保留了其代理的私有内存。
When an agent becomes idle, it retains its agent private memory.
如果代理闲置了较长的一段时间，则其代理私有内存将被调出。
Agent private memory may be paged out if the agent has been idle for a long time.
订阅是由 MQTT 对象处理的，它将正确的信息传递到其代理中。
Subscriptions are handled by the MQTT object which passes the appropriate information to its broker.
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