手电筒的光束扫遍屋内各个角落。 The flashlight's beam scanned every corner of the room.
闪光管一种用于在电子闪光时产生短暂而强烈的光束的气体释放管 A gas discharge tube used in an electronic flash to produce a brief, intense flash of light.
棱镜这种形状的透明体，多为玻璃制成，通常两端为三角形，用来分解穿过柱体的白光，使光束发生色散或用来反射光线 A transparent body of this form, often of glass and usually with triangular ends, used for separating white light passed through it into a spectrum or for reflecting beams of light.
在光记录技术中，指光道上两个凹槽之间的区域。在制作母盘时记录激光束不照射这些区域。参阅pit。 In optical recording, refers to the areas of the data tracks which are between the pits. These are typically the areas not touched by the recording laser beam during mastering.
