sheepskin

详细解释:n. 绵羊毛皮, 羊皮袄, 羊皮纸, 羊皮革, 羊皮毯, (写在羊皮纸上的)文件, 毕业文凭

英语解释：

名词 sheepskin:

tanned skin of a sheep with the fleece left on; used for clothing同义词：fleece