常見例句雙語例句The basical features of sand hazard along the railway are eroding ballast, covering track and wearing equipments in desert and semidesert areas.荒漠、半荒漠地帶鐵路沙害的基本特征是沙侵道床、埋沒軌道、磨蝕設(shè)備。 返回 ballast covering