质点在一个时窗内运动的两个分量的交会图。
A crossplot of two components of particle motion over a time window.
经典力学中有关质点系的运动定律已经表述得相当清楚。
The particle system movement rule has been stated clearly in the classical of force.
到目前为止，我们只关心质点的运动。
Up to now, we have been concerned only with the motion of particles.
到目前为止，我们只关心质点的运动。
Up to now, we have been concerned only with the motion of particles.
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