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leg roller pin 车脚小轮销钉
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A leg with a roller blade wheel telescopes down and I can lock it in place with the pull cable handle.
一条腿的辊叶轮望远镜下来，我可以锁定在与拉电缆处理。
youdao
If you want less pressure, keep one leg off the roller and use the foot to support some of your body weight.
如果你想减少压力，可以保持一条腿在轴上，并用脚支撑一些重量。
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