Definition
Someone who observes or listens to something without being noticed; to be an unseen observer.
偷听偷看者
I wish I could be a fly on the wall to see how they argue during the meeting.
我真希望能当一只墙上的苍蝇，看看他们在会议上是如何争论的。
If I were a fly on the wall, I could know what their real thoughts are.
如果我能当一只墙上的苍蝇，我就能知道他们真实的想法。
I'm curious, I could hear what they say about me in private if I could be a fly on the wall.
我很好奇，如果我能当一只墙上的苍蝇，我就能听到他们私下对我的评价。