four-high rolling mill

例句：

1. 1. This four-high rolling millis used to produce steel products.
   这台四高轧机用于生产钢铁产品。
2. 2. Thefour-high rolling mill is a crucialpart of the manufacturing process.
   四高轧机是制造过程中至关重要的一部分。
3. 3. The four-high rolling mill has been upgraded toimprove efficiency and reduce costs.
   四高轧机已经升级，以提高效率并降低成本。