Valuable web services that shall be included in enterprise business transactions demand models on how service providers can charge for the service's usage.
应包含在企业商务交易中的有价值的Web服务需要关于服务提供者如何对服务的使用进行收费的模型。
Then, demand models at different times are established and the consumers' behaviors are analyzed.
建立不同时刻的需求模型，并对消费行为进行了分析。
Travel demand models predict travel patterns for the future and define the region's needs for the transportation system.
交通需求模型预测未来一个区域内对交通系统的需求。
Travel demand models predict travel patterns for the future and define the region's needs for the transportation system.
交通需求模型预测未来一个区域内对交通系统的需求。
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