基本解釋道床層英漢例句雙語(yǔ)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、半荒漠地帶鐵路沙害的基本特征是沙侵道床、埋沒軌道、磨蝕設(shè)備。ballast covering更多例句詞組短語(yǔ)短語(yǔ)ballast t covering 道床層ballast covering更多詞組專業(yè)釋義土木建筑工程道床層