gōng chǎng / yòng / dù xīn / gōng yì / chǔ lǐ / tiě guǎn / yán cháng / qí / shǐ yòng shòu mìng

工厂用镀锌工艺处理铁管，延长其使用寿命。

The factory uses a galvanizing process to treat iron pipes, extending their service life.