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| 混凝土涵洞 | |||
| 混凝土涵管 | |||
| concrete culvert: 21 phrases in 6 subjects |
| Aviation | 1 |
| Bridge construction | 8 |
| Earth sciences | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Technology | 8 |
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