For example, engineers designing a pavement do not have to base their attempts entirely upon experimentation, but can use reference sources that describe the conclusions of others.
例如，设计路面的工程师并不一定要把他们的尝试完全建立在实验的基础上，而是能用其他人的结论作为参考。
On the client side, changing the interface of the reference might also be out of the question because you would have to change the implementation to use different names.
在客户端，更改引用的接口也可能根本无法办到，因为您必须更改实现以使用不同的名称。
You have to evaluate the use-case model with respect to some frame of reference, such as business needs, business domain, and so on.
你必须应用一些参考框架来评价用例模型，例如业务要求，业务领域，等等。
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