cloud cuckoo-land
口语·形容不切实际的空想
例句
His plan to build a city on Mars is pure cloud cuckoo-land—it's not feasible at all.
典故来源
源自古希腊剧作家阿里斯托芬的喜剧《鸟》，描述一个由鸟类建立的空中乌托邦，讽刺不切实际的幻想。