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| 光学仪器 | |||
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| 光学仪器 | |||
| 光学仪; 光学器械 | |||
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optical instruments : 53 phrases in 13 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electronics | 11 |
| Hydroelectric power stations | 1 |
| Mechanics | 1 |
| Missiles | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Shipbuilding | 2 |
| Space | 5 |
| Surveying | 1 |
| Technology | 25 |