质心: barycenterbarycentricbaryucentercanter of masscenter of gravitycenter of inertiacenter-of-ma systemcenter-of-mass systemcentralcentre of masscentre of inertiacentroidalma centermass center
质心定理: center of ma lawcenter of ma theoremcenter of mass lawcenter of mass theorem
质心坐标系: center of ma coordinatecenter of ma systemcenter of mass coordinate systemcenter of mass systemcenter of momentum coordinate systemcentre of mass coordinates
