A foundation of crushed rock or a similar substance for a road or railroad; a roadbed.
路基碎石或类似物质做的道路或铁路的基础; 路基
roadbed详细解释
road.bed n.（名词） The foundation upon which the ties, rails, and ballast of a railroad are laid.路基：其上可铺铁道的枕木、铁轨和道碴的地基A layer of ballast directly under the ties.道碴：直接铺在枕木下的石碴The foundation and surface of a road.公路地基和公路路面
