如果企图访问这部分空间，无论读写都会造成某种运行时失效。
Any attempt to access that area for reading or writing causes some kind of runtime failure.
例如，只有在由于所访问的页面已经被交换到磁盘上而发生页面失效的情况时，PPE 才会接收到一个中断。
Only when a page fault is hit, for example, because the accessed page has been swapped out to disk, does the PPE receive an interrupt.
当用户访问这个页面时，浏览器首先检查本地缓存，以确定本地文件是否已经失效。
When a user accesses this page, the browser first checks the local cache to determine if the local files have expired.
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