zone-hardened alloy

例句：

1. 1. The new car has a zone-hardened alloy body that is more durable than the previous model.
   这款新车采用了区域硬化合金车身，比之前的型号更耐用。
2. 2. The construction of this bridge uses zone-hardened alloy to ensure its longevity and strength.
   这座桥梁的建设使用了区域硬化合金，以确保其持久性和强度。
3. 3. The engineers were tasked with developing a zone-hardened alloy that could withstand extreme temperatures.
   工程师们被委托开发一种能够承受极端温度的区域硬化合金。