A centerofsymmetry must coincide with the centerof mass.
对称中心必须与质量中心重合。
2
The same holds true for any molecule with a centerofsymmetry.
对任何有对称中心的分子同样是对的。
3
The results shown that, with the effect of nonlinear components, the symmetryof rotation trajectory of the bearing center was broken, and the motion of the journal center presented a steady state.