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。
A method of face center tracking which is based on bilateral symmetry of gradient direction is discussed in this paper.
研究了基于梯度方向双边对称性的旋转人脸中心的跟踪方法。
Our results indicate that the energy valley of conduction band of Ge is not lying in the center of Brillouin zone and the constant energy surface possesses non-spherical symmetry.
这些结果表明锗导带能谷不在布里渊区中心，且具有非球形对称等能面。
The displacement history curves of different points in the symmetry center line of windshield glass and the strain history curves of many points on the surface of windshield glass are obtained.
实验中得到风挡玻璃对称中心线上多点位移时间曲线及风挡玻璃表面的应变时间曲线。
Symmetry for the center line of the sieve.
与筛体中心线对称。
In center of mass system, solved problem of two body had merits of symmetry form, brief description and high precision.
在质心系中，解决两体问题，具有形式对称，描述简洁，精确度高等优点。
The basic structure of the xylonite houses, which is square and half under the earth. The pillar holes have two circles, four points symmetry and gather together to the center.
其房子的基本结构是方形（有时是不规整的方形）半地穴木构建筑：柱洞常呈回字形分布，四角相对，四角起斜脊向中心聚拢，形成支撑主体结构；
The basic structure of the xylonite houses, which is square and half under the earth. The pillar holes have two circles, four points symmetry and gather together to the center.
其房子的基本结构是方形（有时是不规整的方形）半地穴木构建筑：柱洞常呈回字形分布，四角相对，四角起斜脊向中心聚拢，形成支撑主体结构；
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