It had become a nightmare to maintain and upgrade.

想要对它进行维护或升级简直是个噩梦。

youdao

This system is easy to maintain and upgrade and its operation is very simple.

该系统易于维护和升级，操作简单。

youdao

This system is easy to maintain and upgrade and its operation is very simple.

该系统易于维护和升级，操作简单。

youdao