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质点系的运动要比质点的运动复杂得多,对存在质点围绕质心运动和各质点间相对运动类的问题,不能简单地等效为质心的运动。
Particulate motions are much more complicated than motions of particles, and the problem of the presence of motions around the centroid and the relative motions between the motions can not simply be equivalent to centroid motions.