there is no reason why the ball,once in motion,should ever stop这句话怎样翻译?

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• 英语翻译The simple fact shows that the more of the force of friction is got rid of,the farther will the ball travel,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.
• there is no reason why the ball,once in motion,should ever stop这句话怎样翻译?
• there is no reason why the ball,once in motion,should ever stop这句话怎样翻译?
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