文件名称:course
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在本系统中，有三类用户：系统管理员，教师和学生。三种不同的用户所具有的操作权限以及操作内容均不一样。
-In this system, there are three types of users: administrators, teachers and students. Has three different user authority to operate and operation are not the same content.
-In this system, there are three types of users: administrators, teachers and students. Has three different user authority to operate and operation are not the same content.
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