About this episode
你需要邮寄送出一个珍贵的物品。为避免丢失，你用一把锁把这个物品锁在盒子里。同样为了安全，你也不能把钥匙寄给收信人，只能留在自己身边。那么收信人收到这个上了锁的盒子后如何打开呢？当然不能采用暴力破坏的手段。思考一下吧。语音里公布了答案，如果你没有听懂，下次语音节目告诉你。
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