When the implementation of the steps may need to vary at run time. Concrete inheritance can't accommodate this; delegation can.

当这个实现的步骤需要在运行时变化。类继承不能适应这个，代理能。

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This paper tries to analyze how brand-building? Concrete steps are: evaluation of brand strategy, design brand identity systems, the implementation of the brand recognition system.

首先分析如何进行品牌建设？具体步骤为：评价品牌战略、设计品牌识别系统、实施品牌识别系统。

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