In an ideal world, each functional area such as process services, would be "pure", offering only one class of services in order to provide a separation of concerns.

在理想情况下，每个功能区(如流程服务)都是“纯”功能区，为了实现关注点分离仅提供了一个服务类。

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What's more, in pure DBC terms, a class that abides by DBC rules has a contract with the outside world about the internal consistency that it will maintain, which is known as the class invariant.

另外，在纯dbc术语中，遵循dbc规则的类针对其将维护的内部一致性与外部世界有一个契约，即人所共知的类不变式。

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In Figure 3, Shipment is a pure client class and is not assigned to a potential domain package.

在图3中，Shipment是一个纯粹的客户机类并没有分配到一个可能的域包。

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"We're pleased the label clearly demonstrates the Nissan LEAF to be a best-in-class option, reflecting that it's a pure electric vehicle, uses no gas, has no tailpipe and has zero emissions, " said Scott Becker, senior vice president, Finance and Administration, Nissan Americas.

ENGADGET: Nissan Leaf blessed with 99MPG 'equivalent' sticker, roundtable arguments ensue