Make an inner class in the parent class, which is a test case.
在父类中建立一个内部类，这个内部类是个测试用例。
Mixins are classes that are parameterized by their parent class.
mixin是那些由它们的父类参数化的类。
Can I pull more methods from the child into the generic parent class?
是否还能把更多的方法从子类提升到通用的父类中？
For example, we can refer to the parent class of Scrollable as type t.
例如，我们可以将Scrollable的父类引用为类型T。
Each application of this generic class would extend a distinct parent class.
这个泛型类的每个应用都会继承一个不同的父类。
An object adapter can adapt the interface of its parent class.
一个对象适配器可以适配他的父类接口。
We describe a parent class whose elements have a property with cardinality equal to one.
我们描述一个父类，它的元素有一个基数等于一的属性。
This destructor would have to be called specifically before unsetting the parent class reference.
这种解构器必须在解除父类引用之前进行调用。
This destructor would have to be called specifically before unsetting the parent class reference.
这种解构器必须在解除父类引用之前进行调用。
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