名词
中文翻译：回旋引擎
同义词：
['retro-engine', 'retro-motor', 'vintage engine']
例句：
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1. The retro-engine is a rare and valuable antique.
这个复古引擎是罕见的珍贵古董。
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2. The retro-engine was designed to improve efficiency in the early days of automobiles.
这个复古引擎是为了提高早期汽车的效率而设计的。
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3. The retro-engine enthusiasts are passionate about restoring classic cars.
复古引擎爱好者热衷于修复经典汽车。