我们还可以使用封装和继承给现有页面和组件添加新的行为。
We can also use encapsulation and inheritance to add new behavior to existing pages and components.
利用面向对象的概念，如封装、继承和多态性。
Leverage object-oriented concepts such as encapsulation, inheritance, and polymorphism.
OO的关键包括数据封装和继承的概念。
Some of the keys to OO are the data encapsulation and the concept of inheritance.
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