Gravel bed
01
a layer or area of small stones used for drainage, support, landscaping, or planting
文法情報
形態的構成
複合語
例
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
文法情報
例
The garden uses a gravel-bed drainage system.
