Topology abstraction, encapsulation and reuse.

拓扑抽象，封装和重用。

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These constructs support the object-oriented form of encapsulation, where only the essential public abstraction of a class or trait is exposed and implementation information is hidden from view.

这些结构支持面向对象式的封装，即本质上只有类或者Trait的公共抽象会被暴露出来，内部实现则被隐藏于视界之下。

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Most object-oriented programming languages support data abstraction and encapsulation for information hiding.

大多数面向对象语言均支持信息隐蔽的数据抽象和封装。

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