名词
中文翻译：备用系统
同义词：
['standby unit', 'backup system', 'standby power supply']
例句：
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1. Thehospital has a standby system in case of emergencies.
医院有备用系统以防紧急情况。
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2. The generator is the standby system for the hospital's power supply.
发电机是医院电力供应的备用系统。
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3.The engineers are responsible for maintaining the standby system.
工程师负责维护备用系统。