看得见的球的运动轨迹的改变，就可能告诉我们：看不见的球是存在的。
The change in path of the visible ball would tell us about the presence of the invisible ball.
我们的生命是一种运动，一种趋势，是向一个看不见的目标无休止地奋进。
Our life is not a mere fact; it is a movement, a tendency, a steady, ceaseless progress towards an unseen goal.
我们的生命是一种运动，一种趋势，是向一个看不见的目标无休止地奋进。
Our life is not a mere fact; it is a movement, a tendency, a steady, ceaseless progress towards an unseen goal.
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