发光二级管
光二极管
发光二极管
The second problem--getting the light in there--was solved by the invention and refinement of the lightemitting diode and the laser in the past 20 years.
FORBES: The Trials Of Amory Houghton Jr.
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。