Construction: Do a majority of the implementation as you move from an executable architecture to the first operational version of your system.

构建阶段：当你从一个可执行的系统架构迁移到系统的第一个可操作的版本时，需要完成大半的实现工作。

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Typically, the first couple of iterations are devoted to elaborating the key requirements and developing an executable architecture.

通常，最开始的两次迭代都关注于精化关键需求和开发一个可执行的架构。

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What I have done for the last two years is use this executable architecture as the starting code for the software engineering courses.

我在前两年里所做的工作就是，将这一可执行的体系结构作为软件工程课程的出发代码。

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