soldering flame

例句：

1. 1.The soldering flame was so intense that it could melt metal.
   焊接火焰非常强烈，足以熔化金属。
2. 2.The soldering flame was the only thing that could melt the metal.
   焊接火焰是唯一能熔化金属的东西。
3. 3. The soldering flame was so hot that it could damage the electronics.
   焊接火焰太热了，会损坏电子设备。