The shared base-class subobject is called a virtual base class .

共类子象称为虚类。

An entity is a value, object, subobject, base class subobject, array element, variable, function, instance of a function, enumerator, type, class member, template, or namespace.

实体是一个值，象，子象，类子象，组元素，变量，，实例，枚举符，类型，类成员，模板，或名字空间。