The system adopts three-ply structure model, according the usercolonies, it is divided into three sub-systems for students, teachers and system administrators.
本系统采用三层体系结构，并按照用户群体：学生、教师和系统管理员，将系统划分成三个子系统。
The system adopts three-ply structure model, according the user colonies, it is divided into three sub-systems for students, teachers and system administrators.
本系统采用三层体系结构，并按照用户群体：学生、教师和系统管理员，将系统划分成三个子系统。
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