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Figure 5: Building the use-case model.

图5：构建用例模型。

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A use-case model describing the customer expectations.

描述客户期望的用例模型。

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It can be made a model of DNA, or a model of a whole city like this one is, and sometimes they can make the model exist in the silicon of a computer, so you've got a computer model, and other times, they actually use real silicon and sand, which they're doing it, in this case, like a giant hands-on model.

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