单词：relative motion
[化] 相对运动
relative motion的用法和样例：
例句
- The clocks in relative motion keep different times.处在相对运动状态下的几个钟，所记录下来的时间不同。
- 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。
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