visionary unattainable schemes; daydreams
空中楼阁，空想而不可实现的计划，白日梦
my father built castles in the air about owning a boat.我爸爸做了拥有一条船这样的白日梦。
my father built castles in the air about owning a boat.
我爸爸做了拥有一条船这样的白日梦。