Produce an external system model for the case study

为案例研究产生一个外部系统模型。

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Each deployment model instance has one of two types: internal or external.

每个部署模型实例有两种类型：内部或外部。

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Each deployment model instance has one of two types: internal or external.

每个部署模型实例有两种类型：内部或外部。

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