Ring Time Machine invention is very interesting to listen to. Its purpose is to solve the problems of student absenteeism. Schedule collision The collision of the course schedule or have time to learn a little, just set the time on it. It can be used in everyday life, such as when a collision course schedule. When students are absent from class, or when they do not know whether the teacher is teaching? And it can help reduce the problem was to put on probation of the students
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