Lock the stable door when the horse is stolen. 賊去關門。
The jeweller had been burgled twice in a year before he decided to install extra security devices, but it was a case of locking the stable door after the horse has bolted. 這個珠寶商一年內被偷竊兩次后才決定安裝特別的保險裝置，這是一個賊去關門的事例。
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