名词
中文翻译：单行引擎
同义词：
['single-line engine', 'single-row locomotive']
例句：
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1.The single-row engine is a type of steam engine that has a single row of cylinders.
单行引擎是一种蒸汽发动机，具有一排气缸。
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2. The single-row engine was used in the early days of railway transportation.
单行引擎在铁路运输的早期阶段被使用。
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3.The single-row engine was replaced by the double-row engine in the 19th century.
在19世纪，单行引擎被双行引擎所取代。