求翻译：The Single Hardening Model (Kim and Lade 1988, Lade and Kim 1988a and b) is an elasto-plastic constitutive model that includes the various necessary components typical of these types of models, as indicated in Table 1. The function of each component and their physical significance are described in this table (where possible). The parameters occurring in the Single Hardening Model are employed to characterize these components, as shown in Table 2, and while the components have functions and physical significance in the overall model, it may not be possible to assign physical significance to each individual parameter. Rather, these parameters are curve-fitting parameters.是什么意思？

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