theoretical formula的用法和样例：
例句
- It has important significance for expounding the concepts and deriving the formula to be spreaded Zero Flux Plane method.
这些概念的进一步阐明与理论公式的导出，对指导零通量面法的推广具有主要意义。 - A theoretical formula for calculating interaction forces and the stable coefficient of individual slices under instable states was then deduced.
推导出了土坡失稳情况下，计算条间力大小及各土条稳定系数的理论公式。
