fly on the wall片語KK [flaɪ ɑn ðə wɔl] /flaɪ ɑn ðə wɔl/發音片語1隱形的旁觀者、暗中觀察的人口語I'd love to be a fly on the wall at that meeting.我真想當個隱形人,偷偷旁聽那場會議。形容詞1紀實的、跟拍式的The fly-on-the-wall documentary follows three nurses for a year.這部紀實紀錄片跟拍三名護士整整一年。