名词
中文翻译：四行引擎
同义词：
['four-cylinder engine', 'four-stroke engine']
例句：
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1. Thisnew car has a four-in-line engine that makes it very efficient.
这款新车有一个四行引擎，非常高效。
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2. The old bus had a four-in-line engine that was no longer reliable.
旧巴士有一个四行引擎，现在不再可靠了。
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3. The engineers are working on a four-in-line engine to improve the efficiency of the vehicle.
工程师们正在研究一个四行引擎来提高车辆的效率。