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压力 球 : 25 phrases in 14 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Finances | 2 |
| General | 2 |
| Metallurgy | 5 |
| Mining | 1 |
| Nautical | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 5 |
| Wind Energy | 1 |
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