conversion formula的用法和樣例：
例句
- He is good at rapid calculation, and can immediately tell the answer of an arithmetic formula on seeing it.
他的速算能力很強，看過算式后，得數就能脫口而出。 - The rotor current formula of this kind of generator is deduced when considering the stator harmonic stationary magnetomotive force with very simple method in this paper.
在考慮了定子高次諧波恆定磁勢作用的情況下，用極為簡便的方法推導出符合實際的轉子的電流計算式。
