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| 空气过滤器: 135 phrases in 16 subjects |
| Architecture | 2 |
| Aviation | 4 |
| Chemistry | 4 |
| Compressors | 4 |
| Ecology | 1 |
| Electric machinery | 1 |
| Electronics | 9 |
| General | 2 |
| Metallurgy | 1 |
| Nuclear physics | 2 |
| Oil processing plants | 1 |
| Rail transport | 1 |
| Refrigeration | 44 |
| Shipbuilding | 5 |
| Steel production | 1 |
| Technology | 53 |
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