它们大多数发生在过程中的先启和精化阶段。

Most of them take place in the Inception and Elaboration phases quite early in the process.

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在一个项目先启阶段中，应集中关注于降低风险和不确定因素，这是使用RUP优于使用其他迭代化方法的重要优势。

The focus on reducing risks and uncertainties early in a project is one of the key advantages of using RUP over other iterative methodologies.

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在图3中的四个阶段——先启、精化，构建以及产品化——中，主要关注于不同类型风险的减轻。

Each of the four phases shown in Figure 3 — Inception, Elaboration, Construction and Transition — focus on mitigating different types of risks.

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