zhè / zhǒng / gōng / yì / xū / yào / yòng / shāo / jiǎn / qīng / chú / jīn / shǔ / biǎo / miàn / de / yóu / wū

这种工艺需要用烧碱清除金属表面的油污。

This process requires caustic soda to remove grease from the surface of the metal.