策略包括规则和到期间隔来确保存储信息的有效性。
The polices include rules and expiration intervals to ensure the validity of the saved information.
在指定间隔之外的任何关于日程表条目的信息都不会返回。
Any information about calendar entries outside the specified interval is not returned.
选择间隔实际上是一种权衡：是使用较高的间隔值来呈现大量信息，还是使用较低的间隔值来显示非常少量的更改。
Choosing an interval is largely a trade-off between presenting too much information with a high number of intervals, or showing too little change between the intervals when a low number is selected.
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