ballastless track

例句：

1. 1.The ballastless track is a crucial component of the railway system.
   无负荷轨道是铁路系统的关键组成部分。
2. 2. The engineers were tasked with designing the ballastless track for the new bridge.
   工程师们被指派负责为新桥设计无负荷轨道。
3. 3.The ballastless track was installed to improve the efficiency of the train operation.
   安装无负荷轨道是为了提高列车运行的效率。