于是，删除一个 derived class object（派生类对象）的时刻就有了你所期望的行为。将析构 entire object（整个对象），包孕悉数的 derived class parts（派生类构件）：
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If a class method is called for a derived class, the derived class object is passed as the implied first argument.
如一个类方法被派生类调用，派生类对象将被隐含的做为第一个参数传递。
To use an extension, you directly create an object of the extension subclass, which can then use, add, or override features to the parent class it is derived from.
要使用一个扩展，您应该直接创建一个扩展子类对象，然后使用、添加、或者重写特性到父类(它从其中衍生的)。
Within each package, our initial class diagrams were derived from our use cases, business object model, notes, and interviews.
在每一个包中，我们最初的类图都来自于我们的用例、业务对象模型、注释和访谈。
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