In a short time, before the cold winter comes, new wool grows out on the sheep.
不久,在寒冷的冬天到来之前,新的羊毛又在绵羊身上长了出来。
SciShow - Chemistry
And they were all given new wool overcoats to keep them warm.
他们都得到了新的羊毛大衣以保暖。
英语百科
Wool
Wool is the textile fiber obtained from sheep and certain other animals, including cashmere from goats, mohair from goats, qiviut from muskoxen, angora from rabbits, and other types of wool from camelids.
Wool has several qualities that distinguish it from hair or fur: it is crimped, it is elastic, and it grows in staples (clusters).