bi-level model的用法和樣例：
例句
- The principium of the model and TS are introduced, a representative result and the analysis are given.
描述產業選址問題雙層規劃模型的構建過程，介紹演算法的原理，給出具有代表性算例試驗結果和結果分析。 - A double-decker programming model is constructed in the synthetic Problems of networks for heat exchange.
摘要建立了關於換熱網路綜合問題的雙層規劃模型。
