为了说明这种说法的问题，我们可以再次利用这个简单框架。

To illustrate the problem with this statement we can also use the simple frame again.

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从清单6中可以看出，我们再次利用泛型来使所有这些代码类型安全。

As you can see in Listing 6, generics are once again leveraged to make all of this code type safe.

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在宏展开之后，结果可以再次进行宏展开，直到无法再展开。我们可以利用这种特性。

We are taking advantage of the fact that after a macro expansion occurs, the result is then macro-expanded again, continuing until no more expansions take place.

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