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	grotzen grouch grouch bag grouched grouches grouchier grouchiest grouchilier grouchiliest grouchily grouchiness grouchinesses grouching grouchy grouf groufs groughs ground ground (down) ground (out) ground (someone) in ground almond ground along ground angle ground angling

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