这些访问码的价格通常在每门课程80美元到155美元之间不等，学生需要通过这些访问码才能在线使用麦格劳·希尔和培生等教育公司开发的系统。
The codes—which typically range in price from $80 to $155 per course—give students online access to systems developed by education companies like McGraw Hill and Pearson.
OOAD 课程关注于开发面向对象系统的技术细节。
The OOAD class focuses upon the technical details of developing object-oriented systems.
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）。
While teaching a course in computer graphics, the author has developed a software package-The North China University of Technology Graphics System(NGS).
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