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蒸汽机在4号值得这个地方。这是下降的第一件事旅游巨大的努力。更不用说,这系统是改善和创造了现代汽油发动机。
The steam engine deserves this spot on number four. This was one of the first things that decreased the effort of traveling enormously. Not to mention that this system was improved and created the modern day engine that runs on gasoline.
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