从实践上来看，功能需求是根据数据结构和先决/后决条件来表达的。
In practical terms, you express the functional requirements in terms of a data structure and pre- as well as post-conditions.
从实践上来看，功能需求是根据数据结构和先决/后决条件来表达的。
In practical terms, you express the functional requirements in terms of a data structure and pre- as well as post-conditions.
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