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变换气 : 19 phrases in 10 subjects |
| Animal husbandry | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Earth sciences | 1 |
| General | 1 |
| Geology | 1 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Technology | 6 |
| Water resources | 1 |
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