visionary unattainable schemes; daydreams
空中樓閣，空想而不可實現的計劃，白日夢
my father built castles in the air about owning a boat.我爸爸做了擁有一條船這樣的白日夢。
my father built castles in the air about owning a boat.
我爸爸做了擁有一條船這樣的白日夢。
