名词中文翻译
中文翻译：备用的
同义词：
['support', 'reserve']
例句：
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1.The backup system is ready to take over if the main one fails.
如果主要系统失败，备用系统将接管。
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2. We need a backup plan in case of emergencies.
我们需要一个应急计划。
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3. The company has a back-up generator in case of power outages.
公司有一个备用发电机以防停电。