1. A semiconductor diode in which the reverse current varies with the intensity of received light. 
   反向电流随光的照射强度而发生变化的一种半导体二极管。
2. dualistic nature of light 
   光的二象性
3. semiconductor light emitting diode 
   半导体发光二极管
4. A device which transmits an extremely narrow and coherent beam of electromagnetic energy in the visible light spectrum. 
   一种能够发射可见光谱电磁能的极细的相干光束的装置。
5. A quick flash of light; a gleam. 
   光的极快闪烁；闪光

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