预抓取到缓冲池，但从未读取的页面数量。
Number of pages prefetched into the buffer pool, but never read.
为什么我抓取到的单祯图像总是白色的或黑色的？
Why are the videos or single frames I capture always white or black?
一旦FOE抓取到这些内容，它将其加密然后以附件的形式通过email发送出去。
Once FOE fetches the content, it encrypts it and sends it via e-mail much like an attached file.
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