名词
中文翻译：备用系统
同义词：
['standby', 'backup', 'reserve system例句：1. The emergency power supply is a stand-by system that can be activated in case of an emergency.（紧急电源供应是一个备用系统，可以在紧急情况下启动。）']
例句：
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1. The emergency power supply is a stand-by system that can be activated in case of an emergency.
紧急电源供应是一个备用系统，可以在紧急情况下启动。
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2. The company has a stand-by system in place to ensure smooth operations during maintenance periods.
公司已经建立了一个备用系统，以确保在维护期间能够顺利进行工作。
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3.The new software update includes a stand-by system that will allow users to access their files even when the main system is down.
新的软件更新包括一个备用系统，即使主系统出现问题，用户仍然可以访问他们的文件。