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 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.
他坚持认为这并非永动机，也没有违反能量守恒定律，因为驱动器和里面的微波使用不同的坐标系。
He is adamant that this is not a perpetual motion machine, and does not violate the law of conservation of momentum because different reference frames apply to the drive and the waves within it.
以双流体模型为基础，通过质量守恒方程和动量守恒方程的耦合，提出了液液两相系中弥散传质的连续波模型。
A continuity wave model is put forward for the dispersion process of liquid-liquid two-phase system, by coupling mass and momentum conservation equations of two-fluid model.
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