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谷沟 : 22 phrases in 10 subjects |
| Agriculture | 1 |
| Bridge construction | 3 |
| Earth sciences | 1 |
| Ecology | 1 |
| Engineering geology | 1 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Hydrology | 1 |
| Oil / petroleum | 1 |
| Technology | 10 |
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