相比之下，外部系统是公司与其客户群之间的接口。
By contrast, an external system serves as an interface between a company and its customer base.
外部系统的性质、其接口以及信息和控制流对体系结构中的技术构件的下游规范有帮助。
The nature of the external systems, their interfaces, and the information and control flows help in downstream specification of technical artifacts in the architecture.
需考虑三种外部系统：雨刷器接口，挡风玻璃，和汽车电子系统。
Three external systems are considered: the wiper interface, the windshield, and the car electrical system.
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