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| 航路许可 | |||
| 车道间隙; 轨道净空 (保持轨道上的一定空间); 规划建筑线; 建筑限界; 道路、桥梁、隧道等的净空; 建筑净空 | |||
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track clearance : 1 phrase in 1 subject |
| Bridge construction | 1 |
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