marginal meaning的意思|示意

Through the MOC (marginal opportunity cost) analyzed, model of reclaimed wastewater has been given, and expatiate the meaning of the parts of this model;

对边际机会成本深入分析，建立再生水资源的边际机会成本模型，阐述其各要素内涵；

What is marginal method? Please discuss the meaning of this method in manage we are pirates, these data are stolen from youdao economics? (40%)?

什么是边际法？简述边际分析法在管理经济学中的意义？ (40%)？