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| passage of light | |||
| optic pass; optical pass | |||
| optical channel | |||
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光通路 : 30 phrases in 7 subjects |
| Air defense | 1 |
| Anatomy | 1 |
| Communications | 2 |
| Electronics | 16 |
| Space | 1 |
| Technology | 7 |
| Telecommunications | 2 |
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