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可 见度 : 111 phrases in 19 subjects |
| Air defense | 13 |
| Automobiles | 5 |
| Aviation | 4 |
| Chemistry | 2 |
| Ecology | 1 |
| Electronics | 5 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Finances | 1 |
| General | 1 |
| Geophysics | 1 |
| Lighting other than cinema | 1 |
| Metallurgy | 2 |
| Nautical | 1 |
| Oil / petroleum | 4 |
| Radio | 1 |
| Remote sensing | 1 |
| Space | 8 |
| Technology | 54 |
| Water resources | 5 |
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