While teaching a course in computer graphics, the author has developed a software package-The North China University of Technology Graphics System(NGS).
在开设“计算机绘图”课程的同时，作者开发了一个软件包——北方工业大学绘图系统（NGS）。
Finally it is made with the aid of the computer package graphics system.
最后借助电脑包装图形制作系统制作出来。
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