单词：differential device
differential device的用法和样例：
例句
- When the driving pulley rotates, the axis of the differential mechanism will move due to the different diameters of the differential pulleys.当主动轮转动时，由于大小差动带轮的直径不同，差动机构就不会停留在原处，而会以一定的规律移动。
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