rail and-structural steel mill

例句：

1. 1. The newrail-and-structural steel mill will be the largest in the region.
   新的铁路和结构钢轧机将成为该地区最大的。
2. 2.The construction of this rail-and-structural steel mill is expected to start next year.
   预计明年开始建设这座铁路和结构钢轧机。
3. 3. The rail-and-structural steel mill is a major source of energy for the city's transportation system.
   铁路和结构钢轧机是该市交通系统的主要能源来源。