wool density

例句：

1. 1.The wool is so soft and warm that it's perfect for winter wear.
   这种羊毛既柔软又保暖，非常适合冬季穿着。
2. 2. The wool industry is facing challenges due to the changing climate.
   由于气候变化，羊毛产业正面临挑战。
3. 3. The wool fibers are extracted from sheep's wool, which is then spun into yarn.
   羊毛纤维是从羊的羊毛中提取出来的，然后被纺成纱线。