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热气系统 : 57 phrases in 12 subjects |
| Agriculture | 1 |
| Architecture | 2 |
| Automobiles | 9 |
| Aviation | 12 |
| Earth sciences | 2 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Nautical | 2 |
| Refrigeration | 4 |
| Space | 6 |
| Technology | 15 |
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