fly on the wall
US /flaɪ ɑn ðə wɔl/
UK /flaɪ ɒn ðə wɔːl/
成语
旁观者, 不引人注意的观察者
a person who observes a situation without being noticed or involved
示例:
•
I'd love to be a fly on the wall during their secret meeting.
我真想在他们秘密会议时当个旁观者。
•
The documentary offered a fly on the wall perspective of the band's tour.
这部纪录片提供了乐队巡演的旁观者视角。