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主发生器 : 18 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Construction | 1 |
| Electronics | 6 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Steel production | 1 |
| Technology | 4 |
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