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单语范例（未经PONS编辑处理）
The building has 24/7 security and a backup generator provides electricity during power outages.
en.wikipedia.org The plant couldn't last long with just one of its four pumps working off a backup generator.
www.thecoast.ca The transfer switch isolates the backup generator from the electric utility when the generator is on and providing temporary power.
en.wikipedia.org Example, in a nursing home a fire alarm system keeps having problems with their power supply and at times deprogramming the panel every time the backup generator came on.
en.wikipedia.org Amid the confusion, at least two fires were sparked -- one in the school's backup generator.
foreignpolicy.com