flame hardening blowpipe

例句：

1. 1. The engineer used a flame hardening blowpipe to heat the metal before it was cut.
   工程师使用火焰淬火吹管加热金属，然后进行切割。
2. 2. During the manufacturing process, the flame hardening blowpipe is used to remove impurities from the metal.
   在制造过程中，火焰淬火吹管用于从金属中去除杂质。
3. 3. The flame hardening blowpipe is an essential tool for metalworking.
   火焰淬火吹管是金属加工中不可或缺的工具。