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因为月亮在大气层外很高的地方,那里根本没有空气,不存在碰撞和摩擦,所以,月亮绕地球运行的速度不会减慢,也就不会掉下来。
Because the moon is high in the atmosphere, there is no air at all, there is no collision and friction, so the Moon will not slow down or move around the Earth and will not fall.