And we are led to infer that, if all the impeding forces of gravitation and resistance could be removed, there is no reason why the ball, once in motion, should ever stop.
由此可以推论，如能去除一切起阻碍作用的引力和阻力，就没有理由认为，球一旦处于运动中还会再停下来。
And we are led to infer that, if all the impeding forces of gravitation and resistance could be removed, there is no reason why the ball, once in motion, should ever stop.
由此可以推论，如能去除一切起阻碍作用的引力和阻力，就没有理由认为，球一旦处于运动中还会再停下来。
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