A center of symmetry must coincide with the center of mass.
对称中心必须与质量中心重合。
The same holds true for any molecule with a center of symmetry.
对任何有对称中心的分子同样是对的。
The results shown that, with the effect of nonlinear components, the symmetry of rotation trajectory of the bearing center was broken, and the motion of the journal center presented a steady state.
计算结果表明，在非线性因素作用下，轴承中心的轴心轨迹不再具有对称性，而轴颈中心却表现为一种稳定的运动状态。
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