For example, if the retailer decides to offer maintenance contracts for its products, the analyst would add MaintenanceContract to the domain model and refine it to its physical representation.

举例来说，如果零售商决定为其产品提供维护合同，分析师就会将MaintenanceContract添加到域模型，并将其改进为其物理表现形式。

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The duty to bargain and exclusive representation of unions means that the process of entering into these contracts is not one of voluntary exchange comparable to other voluntary business contracts.

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