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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。