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engine heat : 40 phrases in 11 subjects |
| Automobiles | 5 |
| Aviation | 6 |
| Business | 1 |
| Chemistry | 1 |
| General | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Refrigeration | 2 |
| Shipbuilding | 4 |
| Space | 1 |
| Technology | 16 |
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