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English

For example, copies of information on the database prior to its modification by a transaction are set aside by the system before the transaction can make any modifications (this is sometimes called a before image).

Chinese

例如,数据中信息的副本的优先级高于它的改动信息因为在事务做出任何改动之前会被系统晾在一边(这有时被叫做前映像)。