sand bed

例句：

1. 1. Thesand bed is a popular spot for beachcombers to search for treasures.
   沙床是寻宝者寻找宝藏的热门地点。
2. 2. The sand bed is softand easy to walk on.
   沙床柔软，易于行走。
3. 3. The sand bed is anatural habitat for many species of plants andanimals.
   沙床是许多植物和动物的自然栖息地。