tumbling motion的用法和样例：
例句
- In this paper, a new method for measuring the vertical motion straightness and rolling error of machine tools is presented.
介绍了一种测量机床竖直运动直线度和滚动误差的新方法。 - Spheres are connected to the playfield using chains and ropes and the player must cut these constraints to put the spheres in motion.
球体与游戏场景中锁链，绳索相关联，玩家必须切断这些束缚球体的绳索，使球体滚动。
