a shot in the dark idiom informal
无根据的瞎猜
an attempt to guess something when you have no information or knowledge about the subject and therefore cannot possibly know what the answer is
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。