Before I do that though, let me try and give you an analogy to keep this in mind of why we want to basically build these abstractions and what we need in order to have them work together.
在我们看例子之前请让我打个比方，以便你们能记住我们，为什么要建立这些抽象，以及要使它们协调工作，我们需要做些什么。
Why do I keep doing this to myself?
我为何要这样折磨自己？
Why do I keep doing this to myself?
我为何要这样折磨自己？
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