c++ 面向对象，概念问题

Question

类之间的 containsA 和 isA 关系分别指什么呀，说是后者以公有继承实现，那么前者怎么实现

Answer 1

 举例：
class Body
{
};
class Head
{
};
class Person
{
  public:
    Body body;
    Head head;
};
class ChinesePerson
{
};

body、head和Person的关系是Person contains head and body.
ChinesePerson和Person的关系是Chinese person is a person.