So, the general principle is really to try to find one parameter that will let usunderstand what has happened, and then decompose the motion into a sum of simpler effect.
综上，一般方法是找出一个参数,描述运动情况的参数，然后把运动分解。
2
This article introduces its mechanical structure, principle of intelligent control and law of motion.
介绍了抽油机的机械结构、智能控制原理及其运动规律。
3
It follows from the principle of relativity that Newton's second law of motion, although fundamental in classical mechanics, only has an approximate and by no means complete validity.