系统或被开发系统的架构原则。
Architectural principles for the system or systems under development.
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。
Construction: Do a majority of the implementation as you move from an executable architecture to the first operational version of your system.
迭代开发就意味着在每次迭代的最后，系统就可以工作，从而系统行为、架构和设计的规格就可以得到验证。
Iterative development means that the specifications for behavior, architecture, and design are reviewed in the light of what actually worked on the last iteration.
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