| 1. | A center of symmetry must coincide with the center of mass .
对称中心必须与质量中心重合。 |
| 2. | The velocity of the center of mass is constant in the absence of external forces .
在无外力时，质心的速度是常量。 |
| 3. | The origin is located on the axis at the point closest to the center of mass .
原点坐落在转轴上最靠近物体质心的一点。 |
| 4. | To remove the ambiguity, these laws should refer to the velocity and the acceleration of the center of mass .
要避免含糊，这些定律所指的应当是质心的速度和加速度。 |
| 5. | As another example the center of mass of the earth and moon moves in an approximately circular orbit around the sun .
作为另一个例子，地球和月亮的质心就是在一个绕太阳的近似的圆轨道上运行。 |
| 6. | To avoid ambiguity, newton's first and second laws for systems should be restated in terms of the center of mass .
为了避免意义含糊，牛顿第一定律和第二定律用于系统时，应根据质心的观点加以重述。 |
| 7. | Symmetry of physical measure in center of mass system
质心系中物理量的对称性 |
| 8. | Acceleration control of the center of mass
重心加速度制御 |
| 9. | Research on new technology of measuring mass center of mass and eccentricity of the projectile
引信电池性能存储测试方法研究 |
| 10. | In reality , of course , both move together toward their common center of mass
实际上，两者都是朝它们两个共同的质量核心运动。 |
