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混合填充 : 18 phrases in 8 subjects |
| Agriculture | 1 |
| Architecture | 2 |
| Automobiles | 4 |
| Chemistry | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Oil / petroleum | 2 |
| Technology | 5 |
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