When memory is freed by the user, the buddy block is checked to see if any of its contiguous neighbors have also been freed.
当用户释放内存时，就会检查buddy块，查看其相邻的内存块是否也已经被释放。
Police finally managed to get the injured dog off the road, but his buddy continued to block traffic.
警察最后设法把受伤的狗从路上救开了，但它的好友继续阻止交通。
Police finally managed to get the injured dog off the road, but his buddy continued to block traffic.
警察最后设法把受伤的狗从路上救开了，但它的好友继续阻止交通。
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