Warning: file_put_contents(/www/wwwroot/ppbbu/73904.com/cache/fa219b30d92e6c98319e662c4057c145.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/73904.com/index.php on line 55 ballast covering是什么意思，ballast covering的翻译，ballast covering音标、读音、用法和例句_骑士汉英词典
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、磨蝕設備。