copperwelding rod

例句：

1. 1. The welding rod was too hot to touch, so I had to hold it away from my hand.
   焊条太热了，我不得不把它从我的手中移开。
2. 2. The engineer used a copperwelding rod to join the two pieces of metal together.
   工程师用一根铜焊棒将两块金属连接在一起。
3. 3. The copperwelding rod was essential for the construction of the bridge.
   铜焊棒对于桥梁的建设至关重要。