alloy rail steel

例句：

1. 1. Thenew railway line uses alloy rail steelto build its tracks.
   新铁路线使用合金钢轨建造其轨道。
2. 2. The engineers carefully inspected the alloy railsteel for any defects.
   工程师们仔细检查了合金钢轨，以找出任何缺陷。
3. 3. The construction of the bridge was madepossible by the use of high-qualityalloy rail steel.
   这座桥梁的建设得益于使用了高质量的合金钢。