hard lead alloy

例句：

1. 1.The car's engine is made of hard lead alloy.
   这辆车的引擎是用硬铅合金制成的。
2. 2. The construction workers used a hard lead alloy to make the bridge.
   建筑工人用硬铅合金制作了这座桥。
3. 3.The hard lead alloy was resistant to corrosion and had a long service life.
   这种硬铅合金具有抗腐蚀性能，使用寿命长。