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| 光程 | |||
| 光学距离; 可见距离 | |||
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| 光学距离; 光程; 可见距离 | |||
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optical distance : 24 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Desert science | 1 |
| Earth sciences | 2 |
| Electronics | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 10 |
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