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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Analysing in the view of molecular kinetic theory, paste flowability is a shift of molecular mass center by the jump of polymer chain segment, and it affects the mass-transfer directly.
After the equilibrium of fast exchange process is reached, the slow exchange process can be treated as pseudo-single exchange center system by means of the differential kinetic equation.