Let student as teacher

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Today I had a class ,first,I taught them again and again,but some of studdents couldn't always master the points.Then I had a idea:I asked some students who had have mastered to teach the students haven't .As a result, the students mastered the points as quickly as they could .I was very glad. I will  often use this way in my class.In this way ,the students learn well and we are relaxed.