名词
中文翻译：备用电线
同义词：
['backup wire', 'spare wire', 'backup cable']
例句：
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1. The generator issporadically out of order, so we keep a spare wire on hand.
发电机时有故障，所以我们备有备用线。
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2.The car's engine has a spare wire that can be used in case of a power failure.
汽车的引擎有一个备用线，可以在电力中断时使用。
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3. To prevent theft, many stores have spare wires hidden behind the counter.
为了防止盗窃，许多商店在柜台后面藏有备用线。