| 1. | Its own elliptic motion around it will be almost imperceptible .
它绕着质心的椭园运动就几乎看不出来。 |
| 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. | Additional insight is gained by examining the elastic collision of equally massive particles in the center-of-mass frame of reference .
对质量相等的两质点的弹性碰撞更彻底的理解，可通过质心参照系而获得。 |
| 8. | Thus the path of the vehicle mass center must be a circle around the axis, i. e. it must be a minor circle of the earth, lying on a parallel of latitude .
所以飞行器质心的轨迹必须是围绕轴线的一个圆，即它必须是一个平行于纬度线的地球的小圆。 |
| 9. | Symmetry of physical measure in center of mass system
质心系中物理量的对称性 |
| 10. | Centroid position of focal spot of laser beam with aberration
畸变光束的焦斑质心位置 |
