tilt at windmills
对无法实现的目标或虚幻的敌人进行无谓的奋斗或战斗
书面·表达无谓奋斗
英文释义
to fight imaginary enemies or engage in a futile or pointless endeavor
例句
He's tilting at windmills by trying to reform the entire system alone.
典故来源
源自塞万提斯小说《堂吉诃德》，主角将风车当作巨人攻击，比喻徒劳对抗虚幻敌人。