[英语成语] FLOG A DEAD HORSE. — 掌握英语：理解无用努力的说法

白费劲。

成语“Flog a dead horse”比喻无谓地继续努力，指的是继续尝试或讨论一个已经解决或毫无希望成功的事情。它强调在无果的情境下坚持某些行为的无效性，就像打一匹已经死去的马，不可能有任何结果。

示例句子

1. He's just flogging a dead horse trying to get that old car to run again.

   他试图让那辆旧车再次运行简直是徒劳。

2. Arguing with him is like flogging a dead horse; he never changes his mind.

   与他争论就像是在白费力气；他永远不会改变想法。

3. Continuing to ask for funding from that source is like flogging a dead horse; they’ve already said no.

   继续向那个来源请求资金就像是徒劳，他们已经拒绝了。