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顶轴 : 61 phrases in 9 subjects |
| Automobiles | 27 |
| Aviation | 3 |
| Drilling | 1 |
| Electric machinery | 3 |
| Electronics | 1 |
| Hydroelectric power stations | 3 |
| Oil / petroleum | 4 |
| Rail transport | 1 |
| Technology | 18 |
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