Brain Challenge 3: Think Again!

头脑风暴3：再想想！

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Structure your use case model appropriately (Principle 2: Challenge your use case goals and Principle 3: use requirement attributes to determine the best use case model).

适当结构化你的用例模型(原则2：向你的用例目标和原则挑战；原则3：使用需求属性决定最好的用例模型)。

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This challenge makes methods 1 and 3 not feasible because both methods are based on client operations.

这个难题使得方法1与3变得不可行，因为这两种方法都是建立在客户操作的基础之上。

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The Great Irish Links Challenge is a 3-day affair, splitting the entire field into thirds each day and rotating, with one round on each course.

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One afternoon, Lauren's class was building cardboard and construction-paper models of New York landmarks, a lesson that leads up to the challenge of building 3-D models in the computer.

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More ambitious riders grind over the same route (which also includes a 500m climb over Tawonga Gap) in a single day during what is regarded as Australia's toughest cycling event, the annual 3 Peaks Challenge held in March.

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