求翻译：在经典力学中，质点的运动都沿着一定的轨道，任意时刻质点在轨道上的位置和动量都是同时可以确定的.因此，一般说来，一旦我们知道了某一时刻离子的位置和动量以及它与其他物体的相互作用，原则上可以精确地预言在此之后任意时刻粒子的位置和动量.事实上，在经典力学中，也正是用位置和动量来描述质点的运动状态。是什么意思？

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