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再给 : 43 phrases in 15 subjects |
| Aviation | 2 |
| Business | 3 |
| Dentistry | 1 |
| Desert science | 1 |
| Ecology | 2 |
| Economy | 4 |
| Electronics | 1 |
| General | 13 |
| Hydroelectric power stations | 1 |
| Hydrology | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 6 |
| United Nations | 3 |
| Water resources | 3 |
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