It is a partial differential equation satisfied by the electric field e.
这是一个，由电场e确定的偏微分方程。
With the development of electric industry, e-waste pollution has become a serious problem.
随着电力工业的发展，电子废弃物的污染已成为一个严重的问题。
With the development of electric industry, e-waste pollution has become a serious problem.
随着电力工业的发展，电子废弃物的污染已成为一个严重的问题。
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