名词
中文翻译：发动机
同义词：
['power unit', 'motor unit']
例句：
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1. The car has a powerful motor that can reach high speeds.
这辆车有一个强大的发动机，可以高速行驶。
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2. The new model electric car uses a rechargeable battery as its motor.
新款电动汽车使用可充电电池作为其动力来源。
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3. The old steam engine was replaced by a more efficient motor for the new factory.
旧的蒸汽引擎被更高效的电动机取代，用于新工厂。