This design uses a motor driven pinion, which drives each leg in and out through racks mounted to each.
这一设计采用马达传动小齿轮，通过机架固定见安装在每个进出机架上。
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。
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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