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蒸汽機在4號值得這個地方。這是下降的第一件事旅游巨大的努力。更不用說,這系統是改善和創造了現代汽油發動機。
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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