“质心”的拼音？

“质心”的英语可以翻译为：[力] barycenter，barycentre，centroid，center of mass ...

它绕着质心的椭园运动就几乎看不出来.Its own elliptic motion around it will be almost imperceptible.在无外力时,质心的速度是常量.The velocity of the center of mass is constant in the absence of external forces.错误的根源在于混淆了质心与重心 吗 ?Do We Mistake Center of ...