名詞 beam of light:

1. a column of light (as from a beacon)
   同義詞：beam, light beam, ray, ray of light, shaft, shaft of light, irradiation

1. 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.
   棱鏡這種形狀的透明體，多為玻璃制成，通常兩端為三角形，用來分解穿過柱體的白光，使光束發(fā)生色散或用來反射光線