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1. | No pigment combination of red , green, and blue will produce yellow.Yet, if a beam of red light and green |
| 用红、绿、蓝三种颜色怎么也调不出黄色来,可是当一束光和一束绿光重叠时,结果却是黄色。 |
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2. | a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus |
| 当光源来自焦点以产生平行光束或者平行光束以产生焦点的凹入的反射镜。 |
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3. | Alternatively, the ripples can be irradiated from above with a laser beam to produce an instantaneous |
| 或者也可以用一束激光从上面照射波纹,在反射光中产生即时的重建象。 |
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4. | use: solid lasers, which are capable only of providing short Bursts of power, and gas lasers, which produce |
| 通常使用的激光器有两种:只能发出短促脉冲的固体激光器和能发出不间断激光束的气体激光器。 |
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