1712年他制作出大气蒸汽机，是瓦特蒸汽机的前身。
In 1712 he built his atmospheric steam engine, a precursor of James Watt's engine.
到1800年，瓦特蒸汽机比它的前辈卖的更好，他们将其销往全世界。
By 1800, Watt's version was outselling its predecessor, and they were shipping it across the world.
18世纪晚期，詹姆斯·瓦特设计了一种高效的、商业上可行的蒸汽机，随着它的使用成本越来越低，它很快被应用于各种工业用途。
In the late 1700s James Watt designed an efficient and commercially viable steam engine that was soon applied to a variety of industrial uses as it became cheaper to use.
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