PHRASE
難以付諸實(shí)施的構(gòu)想（或計(jì)劃）；渺茫的希望；空口的許諾
If you describe an idea, plan, or promise of something good as pie in the sky, you mean that you think that it is very unlikely to happen.
例句
The true regeneration of devastated Docklands seemed like pie in the sky...
遭毀壞碼頭區(qū)的真正重建看起來希望渺茫。
He can't help thinking it's all just 'pie in the sky' talk.
他禁不住想所有這些不過是“畫餅充饑”的空話而已。