free swing motion的用法和樣例：
例句
- Impulsion may be recognized by the freely swinging back and the participation of all the joints in the forward motion.
自由擺動(dòng)的背部和身體所有關(guān)節都參與向前的運動(dòng)是動(dòng)力的表現。 - A compass is essentially a magnetized needle mounted in such a way that it can swing freely.
實(shí)質(zhì)上，指南針就是一個(gè)支起來(lái)能自由擺動(dòng)的磁針。
