回波电路echo: n. (pl. echoes) 1.回声,反响;共鸣,反 ...circuit: n. 1.(某一范围的)周边一圈;巡回,周游;巡回路线[ ...echo distance measuring circuit: 回声测距电路echo protection circuit: 回波防护电路echo suppression circuit: 回波抑制电路下载手机词典可随时随地查词查翻译