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齿轮轮心 : 29 phrases in 10 subjects |
| Automobiles | 3 |
| Electronics | 1 |
| General | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Nautical | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 16 |
| Wind Energy | 1 |
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