theoretical formula的用法和樣例：
例句
- It has important significance for expounding the concepts and deriving the formula to be spreaded Zero Flux Plane method.
這些概念的進一步闡明與理論公式的導出，對指導零通量面法的推廣具有主要意義。 - A theoretical formula for calculating interaction forces and the stable coefficient of individual slices under instable states was then deduced.
推導出了土坡失穩情況下，計算條間力大小及各土條穩定係數的理論公式。
