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空气 离子 : 17 phrases in 14 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Construction | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 1 |
| General | 2 |
| Household appliances | 1 |
| Metallurgy | 2 |
| Nursing | 1 |
| Space | 1 |
| Technology | 1 |
| Textile industry | 1 |
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