variable coefficient model的用法和样例：
例句
- The utility of the response factor model is not restricted to these processes or by the specific forms of analysis performed.
响应系数模型的效用并不局限于这些过程，也不受进行分析的特定形式的限制。 - The non-adjacent grid conductivity model was used to calculate the flow transmissibility coefficient of fluid flow from the horizontal grid to the bedding grid.
采用非相邻网格传导系数模型计算从水平网格向顺层网格间的流体流动传导系数，实现流体流动的耦合。
