羊毛打包布

例句：

1. 1. The sheep are sheared every year to keep the wool clean and soft.
   每年都会剪羊毛，保持羊毛的清洁和柔软。
2. 2. Wool is a popular material for winter clothing.
   羊毛是冬季服装的热门材料。
3. 3. This wool sweater keeps me warm in cold weather.
   这件羊毛毛衣让我在寒冷的天气里保持温暖。