Subject + 维护 + Object
维护 (wéihù) means "to maintain," "to safeguard," or "to uphold." It is used both for physical maintenance of systems or equipment and for abstract concepts like maintaining rights or order.
这些工人负责维护小区的公共设施。
Zhèxiē gōngrén fùzé wéihù xiǎoqū de gōnggòng shèshī.
These workers are responsible for maintaining the public facilities of the residential community.
我们应该共同维护社会的公平和正义。
Wǒmen yīnggāi gòngtóng wéihù shèhuì de gōngpíng hé zhèngyì.
We should work together to uphold social fairness and justice.
系统每个月都需要定期维护一次。
Xìtǒng měi gè yuè dōu xūyào dìngqī wéihù yī cì.
The system needs regular maintenance once a month.