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He made a working model of a steam engine out of old bits of metal.
他利用废旧金属片制成一个蒸汽引擎的工作模型。
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Water and steam are the working media of thermodynamic facility in power plant.
在火电厂中，水和蒸汽是热力设备中的工质。
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Water and steam are the working media of thermodynamic facility in power plant.
在火电厂中，水和蒸汽是热力设备中的工质。
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