无论是推小孩荡秋千,还是随着行星围绕着太阳转,都涉及了牛顿第二运动定律.该定律的内容是：无论在何时,想要改变一个物体的速度或者是方向,你都必须用一定的力量.
英语翻译Push a child in a swing,or ride a planet around the sun,
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