build castles in the air
白日做夢、空中樓閣
口語·形容不切實際的幻想
英文釋義
to have unrealistic or impractical dreams or plans
例句
He keeps building castles in the air about becoming a millionaire without doing any real work.
典故來源
源自17世紀英國作家約翰·班揚的《天路歷程》,比喻不切實際的幻想,如同在空中建造城堡般虛幻。