分页空间本身是一个特殊的逻辑卷，它存储当前不访问的信息。
The paging space itself is a special logical volume that stores the information that is currently not accessed.
一个好处是，使用次要服务器中的卷影拷贝(shadow copy)来执行外部备份不需要任何特殊硬件。
One advantage is that performing an external backup using shadow copies in the secondary server doesn't require any special hardware.
这个一段DNA分子把自己弯曲在特殊的蛋白质周围而形成非常紧的卷如一段弦一样(如黄色部分所示)。
The single piece of DNA molecule winds itself around special proteins to form into very tight coils like a string (shown in yellow).
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