threefold coverage三重: tripling; ter; treble; three ...覆盖: cover; overlap双重覆盖: double coverage重覆: repeatable; repetition三重: tripling; ter; treble; threefold; triple; tri-◇三重唱 [音乐] (vocal) trio; 三重奏 [音乐] (instrumental) trio下载手机词典可随时随地查词查翻译