You'd have to shut down the entire service, which is done occasionally for maintenance.

你不得不关闭整个服务，这种措施只能在需要维修时偶尔为之。

youdao

Those reactors had been shut down for maintenance since last winter.

从去年冬天开始，这些核反应堆就被关闭进行维护。

youdao

That reactor, Unit 4, had been shut down before the quake for maintenance.

该反应堆，4号机组，已被关闭进行维修前，地震。

youdao