a futile rescue attempt
It’s futile trying to persuade him to change his mind.
The peace talks have proved futile.
It’s futile trying to get him to change his mind.
英语词典包含67175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。