dual problem的用法和樣例：
例句
- I've got an insight into the problem.
我對問題豁然開朗。 - The lecture led him to make a thorough study of the problem.
講座使得他要對問題進行徹底的研究。 - In Chapter six we consider the dual problem, develop several computational procedures based on duality, and discuss sensitivity and parametric analysis.
在第六章中，我們考慮對偶問題，基于對偶建立幾個計算程序，并討論了參數和靈敏度分析。
