1. The iron which formed a tank or a set of pipes may be melted to form a plough or a steam-engine; 
   做成冰箱或管子的铁可以再次熔化来做犁或蒸汽机；
2. Steam drives the engine. 
   蒸气驱动引擎
3. Steam puffing from an engine. 
   蒸汽从发动机里喷出
4. Watt invented the steam engine. 
   瓦特发明了蒸汽机。
5. Who invented the steam engine? 
   谁发明了蒸汽机？

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