Frictional forces may also act when there is no relative motion.
在无相对运动的情况下，也可以有摩擦力的作用。
The relative motion of a particle is an important part of kinematics.
“点的复合运动”是运动学的重要章节。
The contiguous bodies of the system perform controlled relative motion.
系统中各邻接刚体之间作受控的相对运动。
This peculiar and often frustrating experience is an effect of relative motion.
这种奇特的而又经常使人沮丧的经历就是相对运动所产生的效应。
Motion is absolute while stagnation is relative.
运动是绝对的，而静止是相对的。
所有的运动不是相对的？
The reason is that their motion is relative, and relativity.
其原因是在于它们运动是相对的；
This world has some absolute motion relative static, right?
而这世上还有些绝对运动中的相对静止吧？
No direct relationship has been demonstrated between the direction of relative plate motion and linear …
非洲板块与欧洲板块的相对运动方向和由阿尔卑斯期变质岩。
The size of the arrows indicates the relative speed of plate motion.
箭头的大小代表了相应的板块移动速度。
The size of the arrows indicates the relative speed of plate motion.
箭头的大小代表了相应的板块移动速度。
应用推荐