Idiom Magic : BE A FLY ON THE WALL 暗中觀察/偷聽

【明報專訊】I think most of us have wanted to be a fly on the wall at one time or another, for if we could be one we'd be able to eavesdrop(竊聽)on some mighty interesting conversations without being observed. "Oh, I think it would be wonderful to be a fly on the wall so I could overhear(偷聽)what Emily and the girls from the office are saying about my new dress!" Maggie smiled. Lucky for the girls from the office, it's not likely that Maggie will turn into(變成)a fly anytime soon.