seca

例句：

1. 1. The beach is covered with a layer of soft sand.
   海滩上覆盖着一层柔软的沙子。
2. 2. The car was buried in the sand when it hit a rock.
   汽车在撞上石头时被埋在了沙子里。
3. 3. The children were playing in the sandbox, building sandcastles.
   孩子们在沙坑里玩，建造沙堡。