fly-on-the-wall

劍橋詞典

A fly-on-the-wall television programme is one in which the people involved behave normally , as if they are not being filmed .
（電眡節(jié)目）紀(jì)實的
a fly-on-the-wall documentary 紀(jì)實紀(jì)錄片 返回 fly-on-the-wall