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径流数 : 62 phrases in 13 subjects |
| Agriculture | 4 |
| Bridge construction | 1 |
| Desert science | 1 |
| Earth sciences | 5 |
| Ecology | 4 |
| Economy | 1 |
| Engineering geology | 4 |
| Hydroelectric power stations | 7 |
| Hydrology | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 31 |
| United Nations | 1 |
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