A passive data source can be made to have an active interface by an agent that polls it periodically and actively sends information about changes in successive polls.
休眠的数据源也可以有个活跃的接口，方法是让代理定期轮询它，并在接下来的轮询中传输更改的信息。
A passive data source can be made to have an active interface by an agent that polls it periodically and actively sends information about changes in successive polls.
休眠的数据源也可以有个活跃的接口，方法是让代理定期轮询它，并在接下来的轮询中传输更改的信息。
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