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primary air | |||
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main air |
主 空气: 37 phrases in 11 subjects |
Animal husbandry | 1 |
Automobiles | 9 |
Aviation | 1 |
Electronics | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
Metallurgy | 2 |
Nautical | 1 |
Rail transport | 1 |
Refrigeration | 1 |
Shipbuilding | 8 |
Technology | 10 |