硬皮

例句：

1. 1. The old tree has a hard skin that makes it difficult to dig.
   这棵老树有一层硬皮，很难挖。
2. 2. The car's dashboard is covered in hard skin from the sun.
   汽车仪表盘上覆盖着硬皮，是太阳晒的。
3. 3. The fisherman had to scrape off the hard skin before he could touch the fish.
   渔民不得不刮掉鱼身上的硬皮才能摸到鱼。