老师:今天咱们来研究摆的秘密。 (板书:摆的秘密) 老师:大家见过摆吗? 学生:见过。 老师:在哪里见过? 学生:我见过带钟摆的钟,钟摆两边摆。 学生:摇篮。 学生:风吹着树枝摆动。 老师:树枝的摆动与咱们今天研究的不大一样。 学生:手臂摆动。(动作) 老师:(模仿)这个还有点像。今天要研究的摆,有点像秋千和刚才说的摇篮。我先来做一个摆。(介绍实 Teacher: Let's study the secrets of today. (Blackboard: the secret) Teacher: Have you seen the pendulum? Student: seen. Teacher: Where have I seen? Student: I have seen the bell with pendulums, pendulums on both sides. Student: cradle. Student: The wind is blowing the branches. Teacher: The swing of the branches is not quite the same as what we studied today. Student: Arm swinging. (Action) teacher: (imitation) This is still a bit like. The pendulum to be studied today is a bit like a swing and the cradle just mentioned. I'll make a pendulum (Introduction real