并根据我国物价指数变化的特点，进一步建立了上包络线模型．使本文更具实际意义。
Upper envelope model is derived from the characteristics of our price index. This paper is of extensive practical value.
在此基础上，建立了基于二次抛物线形抗剪强度包络线的功能函数。
On such a basis, a performance function based on the shear strength envelope curve in the shape of quadratic parabola was established.
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