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挖孔 : 30 phrases in 10 subjects |
| Art | 1 |
| Bridge construction | 5 |
| Engineering geology | 5 |
| General | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 10 |
| Textile industry | 3 |
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