Track ballast
01
轨道道碴, 铁路道碴
the layer of crushed stones or gravel placed under and around railway tracks to keep them in place and provide drainage
语法信息
有生性状态
无生命
形态构成
复合词
不可数
复数形式
track ballasts
例子
The workers spread new track ballast along the railway line to make the tracks more stable.
工人们沿着铁路线铺设了新的道碴，以使轨道更加稳定。
