求翻译：运用土壤溶质运移方程，我们可以建立污染源各重金属元素扩散方程，并以现在城区的重金属含量确定初值扩散时的状态。在假设存在的河流流速不明显，即通过河流对流传播的重金属污染物较小以及扩散只在水平方向上转移，不考虑垂直方向扩散时，就可以列出重金属污染物在饱和各向同性土壤中运移的基本方程为是什么意思？

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Using the soil solute migration equation, we may establish the source of pollution various heavy metals element diffusion equation, and by time present city heavy metal content determination starting value proliferation condition.Is not obvious in the supposition existence rivers speed of flow, name

Application of soil solute transport equations, we can establish sources of heavy metal diffusion equation, and now heavy metals content when determining the initial diffusion in urban area of the State. Assuming existing river flow is not obvious, that is, by heavy metal pollutants of the spread of

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