物体空间位置的变化称为机械运动,大量事实表明,宇宙中的一切物体都在不停地做机械运动,根本不存在不运动的物体,运动是绝对的,我们平常在研究物体时,说物体在运动还是静止,要看是以哪个物体作为标准,这个被选作标准的物体叫参照物． The change in the position of an object’s space is called a mechanical movement. A large number of facts show that all objects in the universe are constantly making mechanical movements. There is no object that is not moving at all. Movement is absolute. We usually talk about objects when we study objects. In motion or in stillness, it depends on which object is the standard, and the object selected as the standard is called the reference object.