The download cache is limited by size, not by lifetime, so it is possible that the common language runtime will attempt to delete a file that is still in use.

限制下载缓存的因素是大小而非生存期，因此公共语言运行时可能会尝试删除仍然在使用的文件。

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Another reason to set a custom location is when users running your application do not have write access to the directory location the common language runtime USES for the download cache.

设置自定义位置的另一个原因是：运行应用程序的用户对公共语言运行时用作下载缓存的目录位置不具有写访问权限。

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These elements are stored in the browser's file system cache so that the browser needs to download them over the network only once.

这些元素存储在浏览器的文件系统缓存中，因此，浏览器只需要通过网络下载一次这些元素即可。

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The entire crowd-sourced database is too big to store on an iPhone, so we download an appropriate subset (cache) onto each iPhone.

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After the download there are two pieces, one on the server the other in a hard drive or cache.

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