Coding a new extension involves inheriting needed information from the specified base classes.

编写新扩展的代码涉及继承来自特定基本类的信息。

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We consider research for the security properties of information flow of active network as properties of the inheriting class inner flow and flow among different inheriting classes.

继承类内的信息流安全特性可以使用传统的信息流研究方法，继承类间的信息流安全特性则使用基于流的概念进行研究。

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Rough relational database model is Multi-valued information system essentially, inheriting and extending classical rough sets theory. But there is much difference between them.

粗糙关系数据库模型从本质上来说就是多值信息系统，它继承和扩展了经典的粗糙集理论，但与经典粗糙集理论又有着很大的不同。

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