For specific browsers, it might be necessary to vary caching by HTTP headers in addition to the headers that control target-independent caching.
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This is useful if you want to modify a control's markup or behavior for new markup standards or for specific browsers.
如果要修改这些控件的标记或行为，使其适应新的标记标准或特定浏览器，则这样的重写很有用。
For specific browsers, it might be necessary to vary caching by HTTP headers in addition to the headers that control target-independent caching.
对于特定的浏览器而言，除了控制与目标无关的快取之标头外，可能还需要根据HTTP标头来变更快取。
But as for yourself, you're providing a way to associate your arbitrary data instances with specific pieces of information user agents (i.e., browsers) may one day cache.
而对于您自身而言，您是在提供一种方法，将随机的数据实例与某一天可能会缓存的特定用户代理(即浏览器)信息段相关联。
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