1. And yet pure iron is scarcer than gold or diamonds. 
   然而纯铁比黄金或金刚石还罕见。
2. Probably you never saw the silver-white metal, pure iron. 
   你大概从未见过那种银白色的金属，即纯铁。
3. It is common knowledge that iron has little use in its pure state. 
   大家都知道纯态的铁几乎没有用处。
4. it is unknown commercially, and it is difficult to obtain even in the laboratory. 
   从商业的角度看，人们对纯铁一无所知，甚至在实验室里也难取得。
5. As was discussed before , copper seldom is used in its pure form except in the electrical industry. 
   正如前面所研讨过的，除了在电气工业方面，纯铜很少应用。

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