中断允许一个可取消活动来清理正在进行的工作，恢复不变量，通知其他活动它要被取消，然后才终止。
Interruption allows a cancelable activity to clean up any work in progress, restore invariants, notify other activities of the cancellation, and then terminate.
从电子邮件的打断中恢复过来，以与被中断之前一样的工作效率返回到工作中——需要 64秒钟 。
Recovering from an email interrupt, and returning to work at the same work rate as before the interrupt — 64 seconds.
能够重新开始中断的恢复操作，这些操作能够在进行数据库恢复时节省宝贵的时间和工作。
Ability to restart interrupted recovery operations that can save precious time and effort in database recovery situations.
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