动机：问题及该模式如何解决问题的实例？
Motivation: an example of a problem and how this pattern solves that problem.
在开始编码之前，让我告诉你策略模式如何解决问题的。
Let me tell you how strategy pattern solves our problem here before we start coding.
在开始编码之前，让我告诉你策略模式如何解决问题的。
Let me tell you how strategy pattern solves our problem here before we start coding.
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