hoop ladder
环形楼梯 THE CIRCULAR STAIRCASE ; circular stair
碳环梯形聚合物 carbocyclic ladder polymer
梯形环保收缩膜 POF
杂环梯形聚合物 heterocyclic ladder polymer
桶面梯形环 Keystone And Barrel Faced Ring
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而列维梯在这方面只需要一个环形传动带，成本低廉而且便于维修。
The Levytator, on the other hand, has one single loop, making it a cheaper proposition because fewer steps are required.
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