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初二时,老师教我们画电路图。老师让一名同学到黑板上画,等他回到座位后,老师又把其中一条线重新画了一下。我问:“老师,为什么这样画
The first two hours, the teacher taught us to draw the circuit diagram. The teacher asked a classmate to draw on the blackboard. After he returned to his seat, the teacher re-painted one of the lines. I asked: ”Teacher, why did you paint this?