我们应该怎么设计它？
我们在语言设计课程中学到的一件事是每种语言都应该有它的设计目的。
One thing we learn in language design courses is that every language should be designed for a purpose.
这里我们引出的重要概念就是，业务需求规格说明应该描述系统的行为，而不是它的设计。我们经常从客户那里得到类似的反应。
When we introduce the important concept that business specifications should describe the behavior of the system, and not its design, we often get a similar reaction from our clients.
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