...悬殊；两体问题；质心系；近似处理 [gap=365]Key Words: great disparity in mass; two-body problem; frame of center of mass; approximate disposal 前言： 由于质心的性质，使得质心参照系在解决质点组问题中具有重要的地位，这是大 家所熟悉的。
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The velocity of the center of mass has not changed as seen from your frame of reference, because the velocity of center of mass is always the same, remember, because momentum is conserved.
质量重心的速度，并没有发生改变，你在参照系中可以看出，因为质量重心的速度，总是保持不变，要记住，由于动量守恒。
So to get into the center-of-mass frame, you must subtract the velocity of the center of mass from the initial velocities.
要进入重心体系，你就必须减去速度，重心的速度，从原始速度中减去。
Whether you stay in your reference frame or in the reference frame of the center of mass, it's immediately obvious that all the kinetic energy is lost.
无论你在对照系中，还是在质量重心体系，很显然，所有的动能都被损耗了。
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