名词
中文翻译：不中断的备用人员同义词
同义词：
['standby', 'reserve', 'standby crew']
例句：
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1. The backup system is ready to take over if the main system fails.
备用系统准备在主要系统失败时接管。
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2. The team has a standby plan in case of emergency.
团队有应急备用计划。
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3. The flight was delayed due to a technical problem, but there was a standby plane waiting.
由于技术问题，航班延误了，但有备用飞机等待。