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流动空气 : 46 phrases in 12 subjects |
| Automobiles | 6 |
| Aviation | 4 |
| Bridge construction | 2 |
| Ecology | 1 |
| Electronics | 2 |
| Environment | 1 |
| General | 1 |
| Nursing | 1 |
| Refrigeration | 3 |
| Space | 7 |
| Technology | 10 |
| Wind Energy | 8 |
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