ballast covering
基本解释
- 道床层
英汉例句
- The basical features of sand hazard along the railway are eroding ballast, covering track and wearing equipments in desert and semidesert areas.
荒漠、半荒漠地带铁路沙害的基本特征是沙侵道床、埋没轨道、磨蚀设备。
双语例句
词组短语
- ballast t covering 道床层
短语
专业释义
- 道床层