So now we're going to turn off the lights and I want to show you the motion of the center of mass.
我们要关上灯，我想给你们展示，质量重心的运动。
So I mentioned to you that the motion of the center of mass is very uniform in the absence of external forces, and that I can demonstrate for you again with the air track.
我向你们提到过,重心的运动是稳定的,若不受外力，我可以再次演示,在空气轨上。
And ultraviolet light will interact with that little ball, the center of mass, and when I then make it dark, you will only see the motion of the center of mass.
这紫外线光可以，与小球互动，也就是质量重心，当周围暗下来，能看到质量重心运动。
Thus large translation of atoms mass center motion is realized.
从而可实现较大的原子质心动量交换。
A integrated equation set for solving plane parallel motion of rigid body was derived, and the conditions of system of forces simplified on the center of mass plane was discussed.
给出了解决刚体平面平行运动问题的一组完整方程，讨论了力系简化在质心平面内的条件。
According to theorem of motion of centre of mass and theorem of moment of momentum about centre of mass, we derive the theorem of moment of momentum about instantaneous center of rotation.
从质心运动定理和相对质心的动量矩定理出发，导出了相对瞬心的动量矩定理。
The artical analyses the stability of the bicycle from both the motion of mass-center and the gyroscopic action of bicycles.
本文分别从质心运动和车轮的回转效应来分析自行车的稳定性。
The mass center motion equations of a damp-increasing range correction projectile were established by the concept of damp-increasing coefficients.
用增阻系数的概念，建立了增阻式射程弹道修正弹的质心运动方程组。
It is found that basic dynamic equations can be derived from the Chenzi theorem, including three Newton's laws of motion, kinetic energy theorem, the law of motion of the center of mass.
从陈子定理可以推导出质点动力学的基本定理，包括牛顿运动三定律，动能定理，质心运动定理。
As to the conservation of motion of center of mass, the method of absolute coordinate system is generally used in the teaching meterials of theoretic mechanics.
对于质心运动守恒问题，理论力学教材中一般用绝对坐标法进行计算。
Geocenter motion is the relative displacement from the center of mass of Earth to the origin of the Terrestrial Reference Frame.
地球质心(简称地心)是指包括海洋大气等的整个地球的质量中心，地心运动是地球质量中心相对于地球参考框架原点的位移。
The mass center motion equations of a damp-increasing range correction projectile were …
用增阻系数的概念，建立了增阻式射程弹道修正弹的质心运动方程组。
The mass center motion equations of a damp-increasing range correction projectile were …
用增阻系数的概念，建立了增阻式射程弹道修正弹的质心运动方程组。
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