Around 1918 Frank B.McIntosh developed a new type of audio amplifier that incorporated a unity-coupled, bifilarwound output transformer.是什么意思_Around 1918 Frank B.McIntosh developed a new type of audio amplifier that incorporated a unity-coupled, bifilarwound output transformer.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句