A two-level deductive database system has bean designed and implemented in their department.
本文设计并实现了一个二级推理数据库系统。
The two-level deductive database is the amalgamation of a conventional database system and a PROLOG system, which is divided into two levels, the database level and the logic program level.
二级推理数据库是传统的数据库系统和PROLOG系统的结合，它可分为二级：数据库级及逻辑程序级。
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