一个商业或者软件系统可以通过逐一记录下需求陈述来备案，这些陈述也可以通过运用用例设计的原则得到极大的扩展。

A business or software system can be documented by writing single requirement statements, and these statements can be greatly expanded by applying the principles of use-case design.

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此外，布莱尔先生还陈述了他的一些原则，即保守党大概希望新有名无实的项目很多：他是一个自由，销售者，一个大西洋和欧洲的一个超级大国对手。

Mr Blair, moreover, shares many of the principles that the Tories presumably want the new figurehead to project: he is a free-marketeer, an Atlanticist and an opponent of a European superstate.

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原则5：用例描述：陈述“是什么”，而非“如何做”。

Principle 5: Use case descriptions: State WHAT and not how.

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