1. A soft iron rod in a coil or transformer that provides a path for and intensifies the magnetic field produced by the windings. 
   铁心包在线圈内或变压器中的柔软铁条，用于提供道路和加强由线圈曲转产生的磁场
2. When moving one coil near that magnet, the current has just produced. 
   靠近那磁铁转动一线圈时，电流就产生了。
3. economic operation of transformer 
   变压器经济运行
4. inrush current of transformer 
   变压器涌流
5. Do you enjoy transformer? 
   你喜欢变形金刚？

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