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设计合理 : 11 phrases in 10 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Coal | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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