flight of fancy idiom
异想天开；想入非非
an idea that shows a lot of imagination but is not practical
He was talking about cycling across the US or was that just another flight of fancy? 他正在谈论骑自行车横穿美国，这又是一次异想天开吗？
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。