本文首先以电磁场理论为基础，从场与介质相互作用的角度详细分析了介质中电磁场能量密度的物理意义。
This passage bases on electromagnetic field theories, analyzes the physical meanings of electromagnetic energy density from the standpoint of interactions between fields and medium.
本文首先以电磁场理论为基础，从场与介质相互作用的角度详细分析了介质中电磁场能量密度的物理意义。
This passage bases on electromagnetic field theories, analyzes the physical meanings of electromagnetic energy density from the standpoint of interactions between fields and medium.
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