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| 21. | Understanding the tasks is important, and the tasks must be diligently recorded. |
| 理解任务是重要的，并且任务必须仔细记录。 |
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| 22. | Interaction designers must shield users from implementation models. |
| 交互设计者必须要将实现模型隐藏起来，不能让用户看到。 |
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| 23. | We must break this habit. The designer must assure that all modeless dialog boxes are rendered with a clearly noticeable visual difference. |
| 我们必须打破这种习惯，设计师必须确保所有的非模态对话框有清晰醒目的视觉差异。 |
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| 24. | The error message box must illuminate the problem for the user. This means that it must give him the information he needs to make an appropriate plan to solve the program’s problem. |
| 错误消息框必须为用户说明问题，这意味着它必须向用户提供做出一个合适的决定来解决问题所需要的信息。 |
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| 25. | Software that uses database technology typically makes two simple demands of its users: First, users must define the form of the data in advance; second, users must then conform to that definition. |
| 使用数据库技术的软件对用户有两个简单的要求，首先，用户必须预先定义数据形式；其次，用户必须遵守该定义。 |
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| 26. | Personas must be developed and treated with dignity and respect for the people whom they represent. |
| 创建人物角色时，对他们代表的人必须表示尊重。 |
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| 27. | To move an object, it must first be selected. |
| 要想移动对象，首先必须选择它，这就是选择必须发生在鼠标按下时的原因。 |
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| 28. | Personas, like any models, must be based on real-world observation. |
| 人物角色必须像其他模型一样，基于真实世界的观察。 |
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| 29. | Still, they were better than command lines, where you had to remember a sometimes complex command syntax, as well as the exact spelling of every operand you wanted to act upon. |
| 然而它们比命令行要好，因为在命令行中有时你必须记住复杂的命令语法，而且每个操作符的拼写还必须正确。 |
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| 30. | End goals must be met for users to think that a product is worth their time and money. |
| 必须满足用户，让用户感觉他们的时间和金钱花费是值得的。 |
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