老爸心软，他不仅不愿意用这种残忍的方式，还希望牛群能经常晒晒太阳，为此还专门拓展出个牛棚的外院，搭出一方露天的铁护栏。只是那铁护栏，隔个十天半个月的就被牛撞破了，于是，老爸也隔个十天半个月，就在田间地畔追着牛跑。
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The first animals on Earth may have been sea sponges, study suggests