修复操作是不可撤销的！
And the best thing is that refactorings are undoable.
并且最重要的一件事是refactorings是可以撤销的。
An undo unit represents a single unit of undoable work.
复原单位表示一个可复原工作的单位。
As a result, the undo engine has control over the duration of an undoable action.
因此，复原引擎能控制可复原动作的持续期间。
As a result, the undo engine has control over the duration of an undoable action.
因此，复原引擎能控制可复原动作的持续期间。
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