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مروحة : 20 phrases in 9 subjects |
| Acridology | 2 |
| Agriculture | 4 |
| Electric traction | 5 |
| Hydrology | 2 |
| Oil and gas technology | 1 |
| Pulp and paper industry | 1 |
| Soil science | 1 |
| Technology | 2 |
| Water resources | 2 |
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