名词
中文翻译：备用灯
同义词：
['support light', 'backup source']
例句：
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1. The car's backup light is on, indicating that the battery needs to be replaced.
汽车的备用灯亮了，说明电池需要更换。
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2. During a power outage, it's important to have a backup light in case the main lights fail.
在停电期间，重要的是要有备用灯以防主灯失效。
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3. The engineer switched off the backup light and started working on the main circuit.
工程师关闭了备用灯，开始修理主电路。