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课堂上,老师正口沫横飞绘声绘色地讲述着证明三角形内角和的方法。为了让大家更深刻地了解,老师拿出一张报纸,撕下一个三角形,演试着如何将两个
In class, the teacher is talking about the way to prove the angle of the triangle. In order to give everyone a deeper understanding, the teacher took out a newspaper and tore off a triangle and tried to figure out how to put two