一般来说，必须和可能行为是UML和软件开发的基本概念。

Must and may behavior is a fundamental concept of UML and of software development in general.

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当我们把软件工程作为一种一般性概念的集合来讲授的时候，学生们就会对如何建造真正的软件感到一无所获。

When we teach software engineering as a collection of generalities, students learn almost nothing about how to build real software.

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