复原单位表示一个可复原工作的单位。

An undo unit represents a single unit of undoable work.

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复原引擎会追踪异动，并建立包含异动的单一复原单位。

The undo engine tracks transactions and creates a single undo unit that encompasses a transaction.

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复原引擎会追踪异动，并建立包含异动的单一复原单位。

The undo engine tracks transactions and creates a single undo unit that encompasses a transaction.

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