close, lock, etc. the stable door after the horse has bolted
释义
●close, lock, etc. thestabledoorafterthehorsehasˈbolted(BrE) (USclose, etc. thebarndoorafterthehorsehaseˈscaped) totrytopreventoravoidlossordamagewhenitisalreadytoolatetodoso马跑了才去关厩门;贼走关门,为时已晚