4 sentences

1. 这个老旧的机器已经不行了。

   zhè gè lǎo​jiù de jī​qì yǐ​jīng bù​xíng le.

   This old machine is on its last legs.

   Source: Dong Chinese Dictionary

2. 这台老旧的机器需要进行一次大修。

   zhè tái lǎo​jiù de jī​qì xū​yào jìn​xíng yī cì dà​xiū.

   This old machine needs a major overhaul.

   Source: Dong Chinese Dictionary

3. 政府计划对老旧小区进行全面改造。

   zhèng​fǔ jì​huà duì lǎo​jiù xiǎo​qū jìn​xíng quán​miàn gǎi​zào.

   The government plans to fully renovate the old residential neighborhoods.

   Source: Dong Chinese Dictionary

4. 老旧房屋的电线外露，存在安全隐患。

   lǎo​jiù fáng​wū de diàn​xiàn wài​lù, cún​zài ān​quán yǐn​huàn.

   The exposed wires in the old house pose a safety hazard.

   Source: Dong Chinese Dictionary