discrete variable的用法和樣例：
例句
- Moreover, Fibonacci design method was used for structural optimum design with discrete variables.
利用斐波那契數列的規律，提出了離散變數結構優化設計的斐波那契演算法。 - Compared with the common optimization design, the mixed-discrete variable optimization method has been widely used in the area of machine design.
摘要在機械優化設計中，混合離散變數優化方法得到了廣泛的應用，具有較高的工程應用價值。
