我听说过这样一个故事:狼常到一个牧场叼羊,牧场主用了整整一个冬季,请猎手围猎狼群,狼患总算解除了。过了不久,羊群开始流行疫病,羊大批地死掉,比遭受狼患的损失还大。牧场主又请来医生给羊防疫治病,但不知为什么,疫病还是不断发生。没办法,牧场主只好请来一批专家会诊,专家开 I have heard of such a story: The wolf often goes to a ranch and the rancher spends an entire winter. Ask the hunters to encircle the wolves. The wolf suffers finally. Shortly afterwards, the herds began to become epidemics, and the sheep died in large numbers, which was greater than the loss suffered by the wolf. The rancher also invited the doctor to treat the sheep for epidemic prevention. However, somehow, the epidemic continued to occur. No way, the rancher had to invite a group of experts to consult and the experts opened