从动小齿轮
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driven bevel pinion 从动伞齿轮
motor driven shaft and pinion 电动机传动轴和小齿轮
It has a drum with gear ring fitted on it which is driven by pinion.
它有一个桶，上面安装了由小齿轮驱动的齿圈。
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模块上移
模块下移
不移动