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dog-legged stair
archit. 无梯井的层间双折楼梯
tech. 双壁楼梯; 层间双折楼梯; 两跑平行楼梯; 双跑平行楼梯 (指无梯井的双跑平行楼梯)
dog -legged stair: 1 phrase in 1 subject
Technology1

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