关于代位继承的性质，目前有两种不同的观点。
As for the nature of the right of subrogation there are two1' different views.
继承层次关系的根类应该定义虚函数性质的析构函数，即使这个析构函数不做任何的事情。
The root class of an inheritance hierarchy should define a virtual destructor even if the destructor has no work to do.
因为在对象之间的概念上的(类型)关系，这些对象继承来自他们最初分类的共有性质。
Because of this conceptual (is a type) relationship between objects, these objects inherit certain common qualities from their original classification.
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