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开口扳 : 46 phrases in 10 subjects |
| Architecture | 1 |
| Automobiles | 16 |
| Aviation | 1 |
| Drilling | 4 |
| Hydroelectric power stations | 2 |
| Mechanic engineering | 2 |
| Metallurgy | 2 |
| Shipbuilding | 3 |
| Technology | 14 |
| Wind Energy | 1 |
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