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| 21. | The light beam from a laser will not spread out as the beam from a flash light or searching light does |
| 从激光中发出的光束不象手电筒或探照灯发出的光束那样扩散开。 |
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| 22. | light beam localizing device |
| 光束聚集装置 |
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| 23. | light beam level wheel gauge |
| 光束水准车轮仪 |
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| 24. | light beam propagation error |
| 光束传播误差 |
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| 25. | narrow beam flood-light |
| 窄光束泛光灯 |
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| 26. | light-beam recording oscillograph |
| 光束记录示波仪 |
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| 27. | A beam of protons;a beam of light. |
| 质子电波；光束 |
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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. | modulated infra-red light beam |
| 调节红外线光束 |
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| 30. | elementary beam |
| 基本光束，原光束 |
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