我们不打算对每种情况（策略）进行解释，而是为每种情况举个简短的示例帮您了解这个特性是多么有用、强大。

Rather than offer an explaination of each of these conditions (policies), a short example of one of them might help illustrate how cool and powerful this feature is.

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举个例子，假如我创建了一个名为CHTimeStamp的Hello World扩展(有关本例的源代码以及本文中其他示例的源代码，参见下载)。

As an example, I've created a sort of Hello World extension called CHTimeStamp (see Downloads for the source code for this example and the other examples in this article).

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