lock the stable door after the horse has bolted
亡羊补牢
口语·批评迟来的预防措施
英文释义
to take precautions or preventive measures after damage has already been done
例句
Apologizing now is like locking the stable door after the horse has bolted.
典故来源
源自16世纪英国谚语,马跑后才锁门,比喻事后补救为时已晚。