基本解釋空中樓閣；空想，幾乎不可能實(shí)現(xiàn)的計劃。同根派生 castles in the air相關(guān)詞英英字典劍橋英英字典plans that have very little chance of happeningcastles in the air劍橋字典castles in the air柯林斯字典