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| dog-legged stair (指无梯井的双跑平行楼梯); dog-legged staircase (指无梯井的双跑平行楼梯); narrow U stair (指无梯井的双跑平行楼梯); narrow U staircase (指无梯井的双跑平行楼梯); U-stair (指无梯井的 .双跑平行楼梯) | |||
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