demand-supply 基本例句 需求一供给 A numerical model considering water supply by the South- to- North Water Transfer Project is established for water resources demand-supply analysis for Ji nan City. 分析济南市的水资源开发利用现状，预测了中长期需水态势，构建了考虑南水北调供水情况下的济南市水资源供需分析数学模型。 dictall