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| 常 氧: 33 phrases in 11 subjects |
| Agriculture | 2 |
| Automobiles | 2 |
| Ecology | 1 |
| Electronics | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 4 |
| Metallurgy | 1 |
| Space | 3 |
| Sports | 1 |
| Technology | 11 |
| Water resources | 3 |
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