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剩余系 : 18 phrases in 9 subjects |
| Aviation | 2 |
| Business | 1 |
| Earth sciences | 2 |
| Nautical | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 6 |
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