cloud cuckoo land
noun
mass noun
- a state of unrealistic or absurdly over-optimistic fantasy不切实际的幻想; 过分乐观的幻梦：
anyone who believes that the Bill will be effective is living in cloud cuckoo land.
任何相信该法案有效的人都抱着不切实际的幻想。
词源
late 19th cent.: translation of Greek Nephelokokkugia, the name of the city built by the birds in Aristophanes' comedy Birds, from nephelē 'cloud' + kokkux 'cuckoo'.