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.
凯斯勒补充说，相比于其它的自我恢复型材料，这种复合物也有两大缺点：要在受压情况下操作，过程要数小时。
Kessler adds, however, that the new material suffers from two of the main drawbacks faced by other self-healing materials: it requires pressure, and the repair process takes hours.
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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