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free-air | |||
surface air |
地面空气: 16 phrases in 11 subjects |
Aviation | 3 |
Bridge construction | 1 |
Chemistry | 1 |
Earth sciences | 2 |
Explosives and Explosive Ordnance Disposal | 2 |
Geology | 1 |
Oil / petroleum | 1 |
Shipbuilding | 1 |
Space | 2 |
Technology | 1 |
United States | 1 |