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21. | OPTRAC (Optical Tracking-light Beam Rangefinder System) |
| 光学跟踪-光学测距仪系统 |
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22. | light beam localizing device |
| 光束聚集装置 |
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23. | light beam propagation error |
| 光束传播误差 |
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24. | subject to refraction, as of a light beam. |
| 使遭受折射用来描述线偏振光束。 |
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25. | project a light Beam. |
| 投射一束光线 |
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26. | modulated infra-red light beam |
| 调节红外线光束 |
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27. | light beam level wheel gauge |
| 光束水准车轮仪 |
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28. | A light beam rushed to the night sky. |
| 一道光束冲向夜空。 |
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29. | horizontal light beam adjusting screw |
| 水平光调节螺钉 |
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30. | the striking of a light beam on a surface. |
| 光柱照射到某一表面。 |
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