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地下水 沟 : 24 phrases in 10 subjects |
| Agriculture | 3 |
| Animal husbandry | 1 |
| Bridge construction | 1 |
| Ecology | 2 |
| Engineering geology | 2 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Hydrology | 1 |
| Technology | 10 |
| Water resources | 1 |
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