声明一个车基类，有run stop等成员函数，由此派生bicycle类，motorcar类，bicycle和motorcar派生出摩托车motorcycle类，它们都有run，stop等成员函数

以下是一个基于C++的实现：

class Car {
public:
    virtual void run() {
        cout << "Car is running." << endl;
    }
    virtual void stop() {
        cout << "Car is stopping." << endl;
    }
};

class Bicycle : public Car {
public:
    void run() {
        cout << "Bicycle is running." << endl;
    }
    void stop() {
        cout << "Bicycle is stopping." << endl;
    }
};

class Motorcar : public Car {
public:
    void run() {
        cout << "Motorcar is running." << endl;
    }
    void stop() {
        cout << "Motorcar is stopping." << endl;
    }
};

class Motorcycle : public Bicycle, public Motorcar {
public:
    void run() {
        cout << "Motorcycle is running." << endl;
    }
    void stop() {
        cout << "Motorcycle is stopping." << endl;
    }
};

在这个实现中，Car是车的基类，拥有run和stop成员函数，Bicycle和Motorcar都是Car的派生类，它们分别实现了run和stop函数。Motorcycle则同时继承了Bicycle和Motorcar，因此它们的成员函数都会被继承下来，在需要时可以重载这些函数以实现特定的行为。