同时利用父类与子类间数据成员、成员函数的继承关系，可以优化曲线测设程序的整体设计。

Moreover, it can optimize the whole design program by making use of inheritance relations of data members and member functions between the basic class and its derived class.

youdao

如果父类是抽象类且至少包含一个抽象成员，则所有这些成员都将作为非抽象的继承类实现。

If the parent class is an abstract class and if it contains at least one abstract member, then all abstract members will be implemented as non-abstract inheriting classes.

youdao