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。
Caches the entire image into memory.
将整个影像快取至记忆体。
The best way to do this is to remove strong references to caches, image objects, and other data objects that can be recreated later.
最佳方法就是移除强引用的涉及到的缓存，图片对象，以及其它可以在之后使用时还可以重新创建的数据对象。
This method looks in the system caches for an image object with the specified name and returns that object if it exists.
这种方法会在系统缓存中根据指定的名字寻找图片，如果找到了就返回。
If a matching image object is not already in the cache, this method loads the image data from the specified file, caches it, and then returns the resulting object.
如果没有在缓存中找到图片，该方法会从指定的文件中加载图片数据，并将其缓存起来，然后再把结果返回。
If a matching image object is not already in the cache, this method loads the image data from the specified file, caches it, and then returns the resulting object.
如果没有在缓存中找到图片，该方法会从指定的文件中加载图片数据，并将其缓存起来，然后再把结果返回。
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