round-rung ladder 圆棒索梯 ; 带踏棒轻绳梯
The topmost round of his azure ladder had been reached by this time.
这个时候，他的蓝色梯子的最高一级已经达到。
It also emphasises the calculating method for the radius curvature of the round ladder and discusses the problem of rectifying the form of round ladder in prefabrication.
并着重对盘梯曲率半径的计算方法及盘梯预制中的整形问题作了讨论。
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