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apparent horizon (线); apparent level |
视水平 : 30 phrases in 10 subjects |
Aviation | 1 |
Electronics | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
Geophysics | 1 |
Oil / petroleum | 1 |
Remote sensing | 2 |
Space | 2 |
Surgery | 1 |
Technology | 18 |
Telecommunications | 1 |