并从电磁场能量和导体系统能量两个角度来表示互作用能公式。
But use viewpoint of the energy of the electromagnetic field and viewpoint of the energy of the system of conductors expresses interaction energy formulas respectively.
一般的,可以把上面的分析扩展到包含振动，转动以及电磁场能量等等，有问题吗？
OK. In general you could extend this analysis to include vibrations, rotations, energy in a magnetical field, electric field, et cetera. Any questions?
在爱因斯坦看来，电磁场能量本身也是量子化的，辐射场不是连续的，而是由分立的能量子组成的。
In Einstein's opinion, the electromagnetic field energy itself is quantized, the radiation field is not continuous, but composed of discrete can quantum.
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