One good example is the conversion of iron ore into metal machine tool parts.

将铁矿转化为机床金属零件就是一个很好的实例。

youdao

Smelting, metal products and machine-making fell, as a share of industrial output, from 20% in 1991 to 15% in 1996.

ECONOMIST: Chinese statistics

"The archaic system of an X-ray machine and metal detector cannot pick up other potential threats posed by passengers, " Baum says.

CNN: Behavioral screening -- the future of airport security?

"The industry said I was a fool--looking at wood and thinking I could machine it like metal, " he says.

FORBES: Magazine Article