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。
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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