然后，基于规定谁可以签署和谁可以使用一个给定队列上的消息的策略，可以在消息级别上实现额外的粒度。
The additional granularity is then implemented at the message level based on policies about who can sign and who can consume messages on a given queue.
如果没有数据请求阈值策略，就无法知道数据请求队列的大小。
Without a data request threshold policy, you do not know the size of the queue of data requests.
第一种是，对于某一服务策略的请求，减少请求在队列中停留的时间（从而减少总响应时间）。
The first is to reduce the time ARFM keeps the request in the queue for traffic in that service policy (thus reducing the overall response time).
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