路基

bed; roadbed

1. 路基碎石或类似物质做的道路或铁路的基础；路基
   A foundation of crushed rock or a similar substance for a road or railroad; a roadbed.
2. 道碴用来铺公路或铁路路基的粗砂砾或碎石
   Coarse gravel or crushed rock laid to form a bed for roads or railroads.
3. 枕木横放在铁路基上以固定铁轨的梁中的一根，通常为木制
   One of the beams, usually made of wood, that are laid across a railroad bed to secure the rails.

基的英语翻译：