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空 气洁净 : 21 phrases in 12 subjects |
| Aviation | 1 |
| Electronics | 2 |
| Engineering geology | 1 |
| Environment | 2 |
| Exhibitions | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Refrigeration | 4 |
| Space | 1 |
| Technology | 4 |
| Wind Energy | 2 |
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