常見(jiàn)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、半荒漠地帶鉄路沙害的基本特征是沙侵道牀、埋沒(méi)軌道、磨蝕設(shè)備。 返回 ballast covering