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开 口 度 : 39 phrases in 12 subjects |
| Automobiles | 6 |
| Aviation | 1 |
| Chemistry | 1 |
| Communications | 1 |
| Economy | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 16 |
| Mining | 1 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Technology | 7 |
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