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回 挖 : 25 phrases in 9 subjects |
| Architecture | 1 |
| Bridge construction | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Mechanic engineering | 2 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 15 |
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