动点在作复合运动时，若动点的牵连运动只涉及到一个动参考系时，则动点的速度合成已有相应的定理。
There has been theorem developed to expound the multiplex motion of a moving point whose related motion entails only one motion coordinating system.
动点在作复合运动时，若动点的牵连运动只涉及到一个动参考系时，则动点的速度合成已有相应的定理。
There has been theorem developed to expound the multiplex motion of a moving point whose related motion entails only one motion coordinating system.
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