big head disease of sheep

例句：

1. 1. This disease is a major cause of death in sheep farms.
   这种疾病是羊场死亡的主要原因。
2. 2. The veterinarian diagnosed the sheep with the big head disease.
   兽医诊断这只羊患有头大病。
3. 3. The farmers are trying to find a cure for this big head disease.
   农民们正在尝试找到治疗这种头大病的方法。