颜容憔悴的病人对医生说：“我家窗外的野狗整夜吠个不休，我简直要疯了!”
医生给他开了安眠药。
一星期后，病人又来了，看上去样子比上次更疲惫。
医生问：“安眠药无效吗？”
病人无精打采道：“我每晚去追那些狗，可是即使好不容易捉到一只，它也不肯吃安眠药。”
悟语：任何失败追踪溯源的话，都有一个错误的方向。
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