The assumption is that these text, image, stylesheets, audio files can be cached because they are static; that performance is increased by having them in the edge server caches.
这假设这些文本、图像、电子表格、音频文件都可以缓存，因为它们是静态的；把它们放在边缘服务器缓存中可以提高性能。
All caches make decisions about which representations to keep based upon their size, type (e.g., image vs. html), or by how much space they have left to keep local copies.
所有的缓存服务器都回基于文件的大小，类型（例如：图片 页面），或者服务器空间的剩余来确定如何缓存。
Caches the entire image into memory at load time.
在加载时将整个图像缓存到内存中。
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