... 安静;宁静〖quiet;tranquil;peaceful〗 静止,物体不运动(跟“动”相反)〖still;motionless〗 没有声响;寂静〖silent;quiet〗 ...
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The great discovery that Galileo and Newton made is that you don't need a force for a body to move at constant velocity.
伽利略和牛顿的伟大发现就是,物体不需要力来维持匀速运动
It's very clear you don't need a force if something is doing nothing, just sitting there.
显而易见,如果物体没有运动,只是静止状态,那是不需要力的
Nowadays, if you go to outer space, you can check for yourself that if you throw something out, it just goes on forever without your intervention.
现如今,如果你去了外太空,你可以向外抛个物体试试,如果你不打断它,它就会一直运动下去
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