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| 明渠排水; 排水盲沟 | |||
| 明沟排水 | |||
| ditch drainage: 30 phrases in 7 subjects |
| Agriculture | 3 |
| Bridge construction | 2 |
| Engineering geology | 3 |
| Hydroelectric power stations | 8 |
| Hydrology | 1 |
| Rail transport | 2 |
| Technology | 11 |
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