ballast bed道: road; way; route; path渣: dregs; residue; sediment路基: bed; roadbed; subgrade; subs ...道渣: ballast; metal路基: bed; roadbed; subgrade; substructure下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:道渣路基，即可在微信中查询翻译
