Rú / guǒ / bù / jí / shí / wéi / xiū / lǎo / huà / de / guǎn / dào / kě / néng / chéng / wéi / chéng / shì / ān / quán / de / xīn / fù / dà / huàn

如果不及时维修，老化的管道可能成为城市安全的心腹大患。

If they are not repaired in time, aging pipelines could become a serious hidden danger to urban safety.