Every need usually maps to a couple of features, and then features map to use cases and supplementary requirements.

每一个需求通常映射到几个特性，然后这几个特性映射到用例和补充需求。

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Additional trace relationships can be set up between other levels, such as features to stakeholder requests, supplementary requirements traced to features, and requirements to XDE model artifacts.

可以在其他级别上设计额外的跟踪关系，例如从特性到相关者请求、跟踪的辅助需求到特性、需求到xde模型工件等跟踪关系。

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On the lower levels are features, use cases, and supplementary specifications.

较低层次的是特性，用例和补充规约。

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