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交叉架 : 35 phrases in 8 subjects |
| Bridge construction | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Rail transport | 2 |
| Space | 1 |
| Technology | 24 |
| Transport | 2 |
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