2.3　继承通常，不同的对象也会有一些相同的地方。比如，山地车、公路车和协力车都具备自行车的属性：当前速度、当前踏板频率、当前档位等。但它们也有各自的特性：协力车有两个座垫和两个车把，公路车有赛车车把，有些山地车有其他链条以降低变速比。在面向对象编程中，类可以继承其他类的常用状态和行为。在上述例子...

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