马群为何总是给人以充满活力的感觉?因为马蝇对它的叮咬时刻都不放松。在任何一个马群里,都可以发现这个充满哲理的现象:马蝇会不时地在马匹身上叮上一口。马被其叮咬后,疼痒难忍,便用尾巴不停地驱赶;若拂之不去,就会发足狂奔,企图将其甩掉。结果被叮咬的马不仅没有血尽身亡,反而由于不停运动,生 Why does a horse always give a person a feeling of vitality? Because the horse fly does not relax its moment of bite. This philosophical phenomenon can be found in any one of the herdages: the horsefly will occasionally bite on the horse. After the horse is bitten by it, the itchy, it will continue to drive with the tail; if the brush does not go, it will run full run in an attempt to get rid of it. The result was not only the horse did not bite blood death, but because of constant movement, students