多数定制清理器都会观察某些模型对象，并根据更改击发逻辑来使一个或多个缓存页面到期失效。
Most custom sweepers observe some model object, and based on changes, fire logic to expire one or more cache pages.
多数定制清理器都会观察某些模型对象，并根据更改击发逻辑来使一个或多个缓存页面到期失效。
Most custom sweepers observe some model object, and based on changes, fire logic to expire one or more cache pages.
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