Gravel bed
01
a layer or area of small stones used for drainage, support, landscaping, or planting
语法信息
形态构成
复合词
例子
The path was built on a deep gravel bed for better drainage.
gravel-bed
01
related to or using a layer of small stones for drainage, support, filtering, or planting
语法信息
例子
The garden uses a gravel-bed drainage system.
