Now, in class D, an instance of class C is constructed.
现在，在类D 中，构造了类C的实例。
An error for the illegal reference to t inside static class d.
在静态类d中非法引用t的错误。
For example, suppose the programmer is familiar only with the header of class d.
例如，假设程序员只熟悉类d的头。
Suppose you have a derived class D whose base class B has implemented some interfaces.
假设有个类型D，它的基类B实现了某些接口。
In this 2-d class I had to do all these images.
在这个二维课堂上我不得不做所有这些东西。
In this 2-d class I had to do all these images.
在这个二维课堂上我不得不做所有这些东西。
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