If refresh is managed by data expiration, as is the case for Web pages, it can be implemented using keywords inside policies or policy sets to inform any caches how long they can retain the data.

如果由数据过期来管理刷新，就像Web页面情况一样，那么可以使用策略或策略集合内部的关键字，来通知任意的缓存，告诉他们数据可以保持多长时间的方式来实现。

youdao

If refresh is managed by data expiration, as is the case for Web pages, it can be implemented using keywords inside policies or policy sets to inform any caches how long they can retain the data.

如果由数据过期来管理刷新，就像Web页面情况一样，那么可以使用策略或策略集合内部的关键字，来通知任意的缓存，告诉他们数据可以保持多长时间的方式来实现。

youdao