理论上，边际机会成本应该相当于利用一单位某种自然资源的全部成本。
Theoretically, MOC is the whole cost of employing an unit of certain natural resource.
边际机会成本——提供最后一单元商品的额外成本，慎重的做出放弃什么。
Marginal opportunity cost — the additional cost of providing the last unit of good as measured by what is given up.
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；
Through the MOC (marginal opportunity cost) analyzed, model of reclaimed wastewater has been given, and expatiate the meaning of the parts of this model;
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