在你给的例子程序1，显示的方法是在基站和子类的定义和你试图调用它的子类对象。
In your given example program1, display method is defined in both base and sub classes and you are trying to invoke it with the sub class object.
系统具有间隙补偿，子程序调用，图形显示，现场修改工艺参数等标准数控功能。
The CNC system used on the machine enables backlash compensation, subroutine call, graphic display, on-the spot change of machining data and the like standard CNC functions.
CTBUG提供了许多很有用的子程序供用户调用，其中包括有键盘扫描、键盘输入等待，显示更新，数据显示等子程序。
CTBUG supplies a lot of very useful subroutines which may be called by users, including Keyboard Scan, Keyboard Input Wait, Display Update and Data Display subroutines and so on.
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