Light metal track layers increased trafficability through the heavy ground.
轻金属覆层增加了车辆通过笨重路面时的机动性。
2
Officials say the freight train was on the wrong track when it collided with the passenger train during heavy rain.
官员说，这辆货运列车在大雨中与客车相撞时位于错误的轨道上。
3
"As we aggressively continue our work on a heavy-lift-launch vehicle, we are moving forward with an existing contract to keep development of our new crew vehicle on track," Bolden said.