free swing motion

• 自由摆动

free swing motion的用法和样例：

例句

1. Impulsion may be recognized by the freely swinging back and the participation of all the joints in the forward motion.
   自由摆动的背部和身体所有关节都参与向前的运动是动力的表现。
2. A compass is essentially a magnetized needle mounted in such a way that it can swing freely.
   实质上，指南针就是一个支起来能自由摆动的磁针。