功能性的需求用使用用例的术语来描述。
Functional requirements are described in terms of use cases.
每一层反映了一组常见的功能和非功能性的需求。
Each tier reflects a common set of capabilities and nonfunctional requirements.
除了对灵活性和可扩展性的要求外,此方法还能满足一些功能性的需求。
Beyond the requirements for flexibility and scalability, there are also functional requirements that can be fulfilled with this approach.
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