gōng / chǎng / zhèng / zài / gěi / líng / jiàn / dù / xīn / yǐ / yán / cháng / tā / men / de / shǐ / yòng / shòu / mìng

工厂正在给零件镀锌，以延长它们的使用寿命。

The factory is galvanizing the parts to extend their service life.