Truck trailers, for example, are loaded on flatcars and transported by rail to their destination, where a tractor hitches up to the trailer and speeds the goods on to another point.是什么意思_Truck trailers, for example, are loaded on flatcars and transported by rail to their destination, where a tractor hitches up to the trailer and speeds the goods on to another point.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句