Magnetism of the bar magnet is produced by the surface molecule electric current.
磁块的磁性，是由磁块的表面分子电流产生的。
It is the electronic structure of molecule and the interaction between molecule and metal surface.
一是分子的电子结构，二是分子和金属表面的相互作用。
It is the electronic structure of molecule and the interaction between molecule and metal surface.
一是分子的电子结构，二是分子和金属表面的相互作用。
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