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对于月相的形成,学生理解起来有一定的难度。通常的实验方法是这样的:用电灯当作太阳,你自己当作地球,用皮球当作月球;把
For the formation of the moon phase, students understand that there is a certain degree of difficulty. The usual experimental method is this: use the lamp as the sun, treat yourself as Earth, use the ball as the moon,