combinatorial theory的用法和樣例：
例句
- Markowitz portfolio theory has become the footstone of modem finance theory.
摘要馬柯維茨的投資組合理論奠定了現代金融理論的基石。 - The optimization model of multi-product inventory with chance constrained attributes based on behavioral portfolio theory is established, which are solved as well.
結合行為證券投資組合理論建立了一種具有機會約束屬性的多產品庫存優化模型，並給出了其求解演算法。
