中文说明：从变量可见性角度分析，matlab程序运行过程中（以下不特别说明都是指在matlab程序中），不同形式的变量可见范围源于于面向对象编程的概念.
English Description：
From the perspective of variable visibility, in the process of MATLAB program operation (not specifically described below, it refers to matlab program), different forms of variable visible range are derived from the concept of object-oriented programming