山羊皮

例句：

1. 1. The sheep are grazing in the field.
   羊在田野里吃草。
2. 2. Sheep are a source of wool and milk.
   羊是羊毛和牛奶的来源。
3. 3. The farmer has to take care of his flock of sheep.
   农民得照顾他的羊群。