采用了一次拷贝技术来减少数据包在内存中被拷贝的次数；
To reduce the times of memory data is copied the one time copy technique is adopted;
直接内存存取(direct memory access, DMA)引擎执行了第一次拷贝(参见图1)，它从磁盘中读取文件内容，然后将它们存储到一个内核地址空间缓存区中。
The first copy (see Figure 1) is performed by the direct memory access (DMA) engine, which reads file contents from the disk and stores them into a kernel address space buffer.
在你第一次考试前12周，把每一次考试的日期和时间记录在你的计划或日记本上，并拷贝一份贴在家里的墙上。
About 12 weeks before your first exam, record the dates and times for each of your exams in your planner or diary and make a copy to put on your wall at home.
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