sheath rolling

例句：

1. 1.The sheep are sheath rolling in the field.
   羊在田野里正在剥皮。
2. 2.She used a sheath rolling knife to cut the fabric.
   她用一把剥皮刀来剪布料。
3. 3.The shepherd was rolling the wool into balls for storage.
   牧羊人正在把羊毛卷成球以便储存。