同学们，我知道再过几天就放假了，可现在你们需要关心的应该是期末考试，而不是在暑假里干什么。
People, I know vacation begins in a few days, but at the moment you still need to worry more about your final exam than about your summer plans.
找到一个可启动分区后，它把此分区的第一个扇区装载到0x0000： 0x7c 00并执行它。(现在你该知道为什么M BR要把自身向下移了吧！)
When it finds a bootable partition it loads the first sector of that partition into 0x0000:0x7c00 and executes it. Now you see why it moves its code down!
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