air mass reference frame 气团坐标系
Reference mass 基准质量 ; 基准品质
float of the mass reference 地浮动
center-of-mass reference frame 质心参考坐标系
reference particle mass 参考颗粒质量
Center-of-mass frame of reference 质心参考系
Mass Storage System Reference Model 海量存储系统参考模型
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。
The name is a reference to International Prototype kilogram, as a base unit of mass in the International System of Units.
它的名字和国际单位中表示基本聚合物质质量千克有关。
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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