单词underfur
n.: (河狸,海豹等长毛下面的)细软绒毛网络: 内层绒毛；毛皮的
(河狸、海豹等长毛下面的)细软绒毛
A top hat originally made of the underfur of this rodent.
海狸皮大礼帽最初用这种啮齿类动物的内层绒毛制成的高帽
The identification of sheep wool and cashmere underfur
绵羊毛与山羊绒的鉴别