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| 后向反光镜; 后向〔集射〕反射器; 后向〔折回〕反射镜; 空心角隅棱镜 | |||
| 回射器 | |||
| 后向反射器; 反光镜 | |||
| 定向反光路钮; 折回反射镜; 反应镜 | |||
| retroreflector: 9 phrases in 3 subjects |
| Electronics | 2 |
| Space | 3 |
| Technology | 4 |
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