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| 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 staircase: 5 phrases in 2 subjects |
| Architecture | 1 |
| Technology | 4 |
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