Completing the object model (sealed, abstract class attributes and many other details have been addressed).

完善了对象模型(密闭、抽象类属性和许多其他细节都已经解决)。

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The fundamental beauty of object-oriented design lies in its ability to model real-world domain entities and their respective behavior as abstract objects.

面向对象设计最根本的魅力在于，它能够将真实世界领域中的实体及各自的行为建模为抽象的对象。

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The first level consists of the performance object, which is a unit that can model a physical device or abstract component in a system.

第一级包括性能对象，它是可以为物理设备建模，或者抽象系统中组件的单元。

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