One of them describes how electric and magnetic fields are generated by electric charges and their currents. The other describes the absence of magnetic fields that don't come from electric currents.
其中一项指出电场和磁场是怎样由电荷和电流产生的，另一项指出磁场的缺失并不是由电流产生的。
Qualitatively, the equations mean this: Electric fields point out from positive charges and into negative charges, and magnetic fields curl around currents (moving charges).
定性地看，这个方程组意味着：电场是由正电荷指向负电荷，磁场围绕着电流即移动的电荷。
The distribution of surface charges in three-phase transmission lines is uneven and the electric fields of various points are different.
三相输电线路导线表面电荷的分布是不均匀的，各点电场强度的大小也不同。
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