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双面坡 : 35 phrases in 9 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Chemistry | 1 |
| Construction | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 14 |
| Oil / petroleum | 3 |
| Technology | 12 |
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