基本解釋道牀層英漢例句雙語例句The basical features of sand hazard along the railway are eroding ballast, covering track and wearing equipments in desert and semidesert areas.荒漠、半荒漠地帶鉄路沙害的基本特征是沙侵道牀、埋沒軌道、磨蝕設(shè)備。ballast covering更多例句詞組短語短語ballast t covering 道牀層ballast covering更多詞組專業(yè)釋義土木建築工程道牀層