Cách sử dụng
The expression "pie in the sky" means something that may seem very good or promising, but is unlikely to happen or is unrealistic. It's like a dream that is too good to be true. For example, if someone says they will give everyone in the world a million dollars, it's a "pie in the sky" idea because it's not possible. It's used to describe things that are impractical or unlikely to happen, especially when people are being overly optimistic.