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The traceability of requirements through the as-built design is further compelled by the existence of low-level and derived requirements. These requirements are commonly defined by the development team in the course of system requirements elaboration (or prototyping) and the construction of a workable and testable system. This pattern of product evolution is most pronounced in the development of software for embedded targets in which target constraints and hardware requirements must also be considered.这段话是什么意思呀？拜托了！多谢了！各位高手 设计完成时，需求跟踪会因为底层和衍生需求的产生进一步强调。这些需求主要是被开发小组在开发系统需求详述（或做界面原型）和建立一个可工作、可测试环境期间定义出的，这个产品演化模型在开发那种有深入目标（比如目标限制和硬件需求也应该被考虑的）的软件中会更显著。
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