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分 离涡 : 34 phrases in 11 subjects |
| Aviation | 4 |
| Chemistry | 1 |
| Drilling | 1 |
| Ecology | 1 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Oil processing plants | 2 |
| Space | 1 |
| Technology | 14 |
| Wind Energy | 3 |
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