tough alloy steel

例句：

1. 1.This new alloy steel is stronger and more durable than the old one.
   这种新型合金钢比旧的更坚固耐用。
2. 2.The construction of this bridge uses tough alloy steel to ensure its longevity.
   这座桥梁的建设使用了硬合金钢，以确保其持久性。
3. 3. Tough alloy steel is often used in industrial machinery to resist wear and tear.
   硬合金钢常用于工业机械中，以抵抗磨损。