ternary steel

例句：

1. 1. The construction of the bridge required the use of ternary steel for its reinforcement.
   建造这座桥需要使用三元钢进行加固。
2. 2. The engineers used ternary steel to make the machine stronger and more durable.
   工程师们使用三元钢使机器更强壮、更耐用。
3. 3. The ternary steel was chosen due to its high strength and resistance to corrosion.
   选择三元钢是因为它具有高强度和抗腐蚀性能。