urine stained wool

例句：

1. 1. The stain on the wool is from a recent trip to the beach.
   羊毛上的污渍是最近去海滩时留下的。
2. 2.The wool was dyed with urine before it was woven into clothing.
   羊毛在被编织成衣物之前，是用尿液染过的。
3. 3. The urine-stained wool has been used as a source of inspiration for many artists.
   用尿液染色的羊毛为许多艺术家提供了灵感。