... responsibility of protection 维护职责 motor system 运动系 motor system 运动系统 ...
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这个周日我们与运动系有一场比赛。
确定了相对静止系、相对匀速运动系、相对加速运动系的概念。
Some concepts such as relative rest reference frame, relative uniform motion reference frame, and relative accelerated motion reference frame was confirmed.
与其开车到处跑，不如系好鞋带，一边运动一边省汽油。
Instead of driving everywhere, lace up your sneakers and get some exercise while you save gas.
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