vacuum metallurgy

例句：

1. 1. Vacuum metallurgy is an essential process in the production of electronic devices.
   真空冶金是生产电子设备过程中必不可少的一个环节。
2. 2.The researchers used a vacuum metallurgy technique to improve the quality of the steel.
   研究人员使用一种真空冶金技术来提高钢材的质量。
3. 3.Vacuum metallurgy has been widely used in the manufacturing industry to reduce waste and increase efficiency.
   真空冶金在制造业中被广泛使用，以减少浪费并提高效率。