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零件结构 : 17 phrases in 10 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Business | 2 |
| Chemistry | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Technology | 2 |
| Wind Energy | 1 |
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