four-cylinder locomotive

例句：

1. 1. The new four-cylinder locomotive is expected to significantly improve the efficiency of the railway system.
   新型四缸机车预计将显著提高铁路系统的效率。
2. 2.The engineer was proud of the four-cylinder locomotive he had built himself.
   这位工程师为自己建造的四缸机车感到自豪。
3. 3. The four-cylinder locomotive was a marvel of engineering and a symbol of progress in transportation.
   这台四缸机车是工程奇迹，也是运输进步的象征。