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| 21. | A very narrow, pencil-like beam is used to discover the exact position of a particular aircraft. |
| 它们使用一种非常细、像铅笔一样的波束来测定某一架飞机的确切位置。 |
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| -- 来源 -- 英语阅读100(2) - Ⅸ. Science and Technology Part 91 Radar |
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| 22. | A device which transmits an extremely narrow and coherent beam of electromagnetic energy in the visible |
| 一种能够发射可见光谱电磁能的极细的相干光束的装置。 |
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| 23. | As we've seen, the laser is distinctive in that it emits all its energy in the form of a single, narrow |
| 我们已经看到，激光器的一个突出之点，就是把全部能量都集中在一个很窄的，由受衍射限制的光束内射出。 |
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