名词
中文翻译：Unknown
同义词：
['support', 'backup', 'reserve', 'standby']
例句：
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1. Weneed to back up our data regularly to avoid losing it in case of a system failure.
我们需要定期备份数据，以防系统故障导致数据丢失。
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2.The company has a backup plan in case of an emergency.
公司有应急计划作为备用方案。
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3. The teacher asked the students to stand by for the next question.
老师要求学生准备回答下一个问题。