如果您管理自己的错误复原，则必须跟踪已经执行的操作，并知道在随后的操作失败的情况下如何取消每个操作。

If you were managing your own error recovery, you would have to keep track of which operations you've already performed, and how to undo each of them if a subsequent operation fails.

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如果某个事件或错误发生而导致流程取消，已经完成的活动需要被复原。

If an event or an error occurs which causes the process to cancel, the already completed activities need to be undone.

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