The contribution of surface excitation in electron-solid interactions is estimated via the numerical evaluation of total surface excitation probability, known as surface excitation parameter (SEP).
表面激发对电子—固体相互作用的贡献是用总表面激发几率的数值积分而得到的，此即为表面激发参数(sep)。
Next, we need an evaluation function that will take the AST and evaluate it to a numerical value. This is pretty straightforward to write, given the power of pattern matching.
接下来，我们需要一个求值函数，它将会获取AST，并求出它的数字值。
The results may not only be adopted for structure design and strength evaluation of the container, but also collated with the values from the numerical calculation.
该实验结果为扁挤压筒的强度计算及结构设计提供了参考依据，也与数值分析解起到相互佐证的作用。
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