Cathode ray tube; vacuum tube,eg the picture tube of a TV set,in which cathode rays produce a luminous image on a fluorescent screen是什么意思_Cathode ray tube; vacuum tube,eg the picture tube of a TV set,in which cathode rays produce a luminous image on a fluorescent screen在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句