complement operation
补充业务操作 Supplementary service operations
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补充操作在主节点恢复时退回主节点。
The complementary action is to failback when the primary node is recovered.
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通过加载Linux来替代(或补充)主机操作系统，可以使老式机器焕发新的活力。
You can give older machines a new life by loading Linux instead of (or in addition to) the host operating system.
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