be at one's wits end
⇒ 他什么都试过了,最后还是束手无策。
He'd tried everything, and in the end he was at his wits end.
英语词典包含298861条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。