electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
同义词:loudspeaker??/??speaker??/??loudspeaker system??/??speaker system
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。