Only a person with administrative rights can backdate a Transaction.
只有具有行政权的人才可以将交易倒填日期。
This algorithm establish transaction-tree which is based on transaction database create frequent itemsetby backdate reversely from leaf nodes.
此算法主要利用事务数据库建立事务树的方法，由叶子结点反向回溯，导出频繁集。
Managing mode based on many edition of drawing database is expounded it recorded expressly the course of edition and backdate correctly for many edition.
