它们是利用宏观动能密度对磁能密度的比例导出的。

They are derived by use of the ratio of the macroscopic kinetic energy density to the magnetic energy density.

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它们是利用宏观动能密度对磁能密度的比例导出的。

They are derived by use of the ratio of the macroscopic kinetic energy density to the magnetic energy density.

youdao