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环空控制 : 26 phrases in 11 subjects |
| Automobiles | 1 |
| Aviation | 3 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 1 |
| Mining | 5 |
| Oil / petroleum | 7 |
| Refrigeration | 1 |
| Space | 3 |
| Technology | 1 |
| United Nations | 1 |
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