事实上，这个系统通常会阻止任何想要注册他们不应该选的课程的人，也就是那些没有选必选先修课程的学生。
In fact, usually the system blocks anyone trying to sign up for a class they shouldn't be taking, who hasn't taken the courses you are required to do first as prerequisites.
统计课程是必备的先修课程。
本课程为所有高等行销课程的先修课程。
This course is a prerequisite for all of the advanced marketing courses.
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