单词	center of mass
释义	center of mass noun phrase : the point in a body or system of bodies at which the whole mass may be considered as concentrated Word History First Known Use 1862, in the meaning defined above
随便看	select mortality table select school selectable selectance selected selectee selectees selecter selectest selecting selection selection forest selection rule selection value selectionism selectionist selectionists selections selective selective absorption selective assembly selective breeding selective cutting selective estrogen receptor modulator selective flotation

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