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| air circulation | |||
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| air circulation | |||
| 空气 环 流: 16 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 4 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| Metallurgy | 1 |
| Space | 1 |
| Surgery | 1 |
| Technology | 4 |
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