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| 桥门净空; 桥门限界 | |||
| 桥门〔人口，隧道口〕净空 | |||
| 隧道口净空; 门座净空; 入口净空; 桥洞净空 | |||
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portal clearance : 5 phrases in 2 subjects |
| Bridge construction | 2 |
| Technology | 3 |
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