名词
中文翻译：备用马达
同义词：
['standby motor', 'emergency motor例句：1. The spare motor is used to power the generator when the main one fails.（备用马达用于主马达失效时为发电机供电。）2. The car had a spare motor installed in case of an emergency.（汽车装有备用马达，以防紧急情况。）']
例句：
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1. The spare motor is used to power the generator when the main one fails.
备用马达用于主马达失效时为发电机供电。
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2. The car had a spare motor installed in case of an emergency.
汽车装有备用马达，以防紧急情况。
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3. The engineer replaced the faulty motor with a spare motor to save time.
工程师用备用马达替换了故障的电机，以节省时间。