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动力中心 : 30 phrases in 12 subjects |
| Automobiles | 1 |
| Aviation | 6 |
| Earth sciences | 4 |
| Economy | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 4 |
| Technology | 5 |
| Wind Energy | 2 |
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