4 sentences

1. 这台机器需要定期保养。

   zhè tái jī​qì xū​yào dìng​qī bǎo​yǎng.

   This machine needs regular maintenance.

   Source: Dong Chinese Dictionary

2. 这辆车需要定期去店里做保养。

   zhè liàng chē xū​yào dìng​qī qù diàn lǐ zuò bǎo​yǎng.

   This car needs to be taken to the shop for regular maintenance.

   Source: Dong Chinese Dictionary

3. 士兵们正在训练场上耐心地保养手中的枪械。

   shì​bīng men zhèng​zài xùn​liàn​chǎng shàng nài​xīn de bǎo​yǎng shǒu zhōng de qiāng​xiè.

   The soldiers are patiently maintaining their firearms on the training field.

   Source: Dong Chinese Dictionary

4. 他虽然五十多岁了，但保养得非常好。

   tā suī​rán wǔ​shí duō suì le, dàn bǎo​yǎng de fēi​cháng hǎo.

   Although he is in his fifties, he has kept himself in very good shape.

   Source: Dong Chinese Dictionary