sand skin

例句：

1. 1. The beach is covered in soft sand.
   海滩上覆盖着柔软的沙子。
2. 2. The old ship was buried in sand and rocks.
   旧船被埋在沙子和岩石中。
3. 3. The children played in the sandbox all day.
   孩子们整天在沙坑里玩耍。