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导线 头 : 24 phrases in 9 subjects |
| Automobiles | 3 |
| Aviation | 1 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 2 |
| Shipbuilding | 5 |
| Space | 6 |
| Technology | 3 |
| Wind Energy | 1 |
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