这是因为实际的源代码和变量绑定可以更改，这是建立在环境或者构建宏预处理程序指令的时间定义的基础上的。
This is because the actual source code and the variable binding can change, based on the environment or the build time definitions of macros and preprocessor commands.
鉴于两者的优越性，提出一种新的编程方法，将图形编程和宏编程相结合，用图形化的方法形成对宏程序的调用指令。
Considering the advantages of the two ways, a new approach is proposed which combines them with each other by using graphs to form macro-call instruction.
探讨了常见非圆弧曲线的加工方法，并以椭圆及正弦曲线为例，叙述了在使用宏指令加工过程中坐标值的数据转换及程序编制。
The way to process non-arc curves was discussed. Illustrating ellipse and sinusoid curves, the coordinate conversion and programming in the process of using macro command were stated.
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