Similarly, those who practice portfolio management must learn from the essential principles if they want the discipline to work effectively.
同样的，那些实践项目组合管理的人，如果要使规程有效，就必须学习必要的原则。
Design principles operate at several levels of granularity, ranging from the general practice of interaction design down to the specifics of interface design.
设计原则作用于不同的层面，上至普遍的设计规范，下至交互设计的细节。
Editors ought to comply with such principles from the aspects such as morality practice, editing, daily life, etc.
编辑应在道德实践、编辑工作、日常生活等方面遵从这些原则。
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