Ring Time Machine's invention looks very interesting. Its purpose is to solve the problem of students such as absenteeism, the collision of class schedule, or have time to learn a little. Just set the time on it, And then it will gradually go back in time in the past. It can be used in everyday life, such as when the class schedule collision, when students are absent from class, or when they do not know whether the teacher is teaching what to do. The students like it because they can go back in time in order to review the lesson or the content again. And it can help reduce the problem was to put on probation students.
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