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.
我真希望能當一隻牆上的蒼蠅，看看他們在會議上是如何爭論的。
If I were a fly on the wall, I could know what their real thoughts are.
如果我能當一隻牆上的蒼蠅，我就能知道他們真實的想法。
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，如果我能當一隻牆上的蒼蠅，我就能聽到他們私下對我的評價。