run of steel

例句：

1. 1. The train was running on the new steel tracks.
   火车正在新铺设的钢轨上运行。
2. 2.The engineer inspected the run of steel before starting the project.
   工程师在开始项目前检查了钢轨。
3. 3.The construction crew had to run the steel rails for several hours.
   施工队不得不连续几个小时铺设钢轨。