用这个策略，可以前后转移到逻辑数据库模式的任何状态。
With this strategy, you can move up or down to any logical database schema state.
一组业务策略，它们是企业所依仗的运营逻辑。
A set of business policies, which are the logic by which business operates.
在根据这种策略而建立的知识蕴涵命题逻辑系统中：1。
In the knowledge implication propositional logic system which build on this strategy, 1.
这种策略逻辑明确，控制性能优越，实现简单、可靠。
It has a concise logic and it is much easy and reliable to implement.
这种策略逻辑明确，控制性能优越，实现简单、可靠。
It has a concise logic and it is much easy and reliable to implement.
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