ballasted track

例句：

1. 1. The engineers carefully ballasted the track to ensure stability during construction.
   工程师们仔细地铺设轨道，以确保施工期间的稳定性。
2. 2. The new railway line is designed to be ballasted with sand and gravel to improve its durability.
   新铁路线设计为用沙子和砾石填充，以提高其耐用性。
3. 3. The ballasted track was a critical component in the design of the bridge.
   带负荷的轨道是桥梁设计的关键组成部分。