1. If iron is left exposed to damp air, it will rust away to powder. 
   如果铁暴露于潮湿空气之下就会慢慢生锈腐蚀成碎末的。
2. a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet. 
   由在铁芯上缠绕的线圈构成的临时磁铁；当电流通过线圈铁芯就会变成磁体。
3. The centre of the earth consists of an iron core, probably with some nickel mixed in. 
   地心是铁芯组成，可能还混有一些镍。
4. The rotating part of a dynamo, consisting essentially of copper wire wound around an iron core. 
   电枢电机的转子部分，主要包括绕在软铁心上的铜线
5. a coil of wire around an iron core; becomes a magnet when current passes through the coil. 
   缠在铁核上的线圈；当电流通过线圈时变成磁体。

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