When the calf is stolen, the farmer mends the stall.亡羊补牢，犹为未晚。

We should avoid locking the stable door after the horse has bolted.我们应该避免亡羊补牢。Lock the barn after the horse is stolen.贼去关门；亡羊补牢。Shut the barn after the horse is stolen.贼去关门；亡羊补牢。Never too old to learn, never too late to turn.亡羊补牢，为时未晚。To shut the stable door when the steed is stolen.亡羊补牢，贼去关门。It is not too late to mend the fold even after some of the sheep have been lost.亡羊补牢，犹未为晚。Lock the stable door after the horse has been stolen.贼去关门。;亡羊补牢未为晚矣。