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常规系统 : 22 phrases in 12 subjects |
| Automobiles | 2 |
| Aviation | 4 |
| Chemistry | 1 |
| Drilling | 1 |
| Electronics | 1 |
| General | 1 |
| Geophysics | 2 |
| Nuclear and fusion power | 2 |
| Oil / petroleum | 1 |
| Space | 4 |
| Technology | 2 |
| Telecommunications | 1 |
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