 |
| |||
| trunk | |||
| main | |||
| arterial | |||
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| mains-operated | |||
|
干 线的 : 46 phrases in 14 subjects |
| Air defense | 2 |
| Architecture | 3 |
| Automobiles | 8 |
| Aviation | 1 |
| Drilling | 1 |
| Electronics | 2 |
| General | 8 |
| Geophysics | 1 |
| Logistics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 12 |
| Telecommunications | 1 |
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