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。
I will then transfer to the center-of-mass frame, and I will show you, then, this quite amazing property.
我将它转化到重心体系，我会给你们展示，这是神奇的性质。
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。
Now I'm going to do the same calculation in the center-of-mass frame.
我们会做同样的计算,在质量重心体系中。
So we're dealing here with the center-of-mass frame, and now I'm going back to the laboratory frame.
我们解决的是，质量重心体系，我们现在要回到实验组。
Geocenter motion is the relative displacement from the center of mass of Earth to the origin of the Terrestrial Reference Frame.
地球质心(简称地心)是指包括海洋大气等的整个地球的质量中心，地心运动是地球质量中心相对于地球参考框架原点的位移。
The threshold energy formula of nuclear reaction in which energy is absorbed is obtained using laboratory frame. It is consistent with the result obtained in mass center frame.
在实验室坐标系下，给出吸能核反应所要求的阈能，其结果与质心系下得到的结果完全一致。
Data measured in the laboratory frame were converted to that in the center-of-mass frame to obtain product kinetic energy distributions and angular distributions in the center-of-mass frame.
通过把实验数据从实验室坐标系转化到质心坐标系，得到反应产物在不同质心角度下的平动能分布和角度分布。
Data measured in the laboratory frame were converted to that in the center-of-mass frame to obtain product kinetic energy distributions and angular distributions in the center-of-mass frame.
通过把实验数据从实验室坐标系转化到质心坐标系，得到反应产物在不同质心角度下的平动能分布和角度分布。
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