... page addre register 页面地址寄存器 page data register，PDR 页面数据缓存器 page control register，PCR 页面控制缓存器 ...
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我也可以选择在rhtml页面中指定超时和缓存方法，但我更愿意使用基于控制器的方法。
I could have also chosen to specify the timeout within the RHTML page along with the cache method, but we prefer the controller-based method.
页面和分段缓存二者均在控制器级别发生。
Both page and fragment caching occur at the controller level. You need to tell rails.
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