The key to establish model and predict lies in the determination of model parameters, which include generally dispersion coefficient and retardation factor.

构造模型进行预测的关键在于确定模型参数，在土壤溶质运移模型中一般包括弥散系数和延迟因子两个参数。

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The results show that the retardation coefficient is negatively related with transport distance and diffusion depth of these nuclides.

结果表明：在其它条件相同的情况下，迟滞系数与这三种核素的迁移距离、扩散深度成负相关关系。

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