copper-zinc welding rod

例句：

1. 1.The welding rod is used to connect two pieces of metal together.
   焊条用于将两块金属连接在一起。
2. 2. Copper-zinc welding rods are commonly used in construction and manufacturing.
   铜锌焊条在建筑和制造中常被使用。
3. 3. The welding rod was too hot to touch, which made the process difficult.
   焊条太热，无法触摸，使得这个过程变得困难。