在清单10中，我们看到可以方便地包含两个文件并在希望调用的名称空间之间进行切换。
In Listing 10, we see how easy it is to safely include both files and switch between the namespaces we wish to call.
在清单10中，我们看到可以方便地包含两个文件并在希望调用的名称空间之间进行切换。
In Listing 10, we see how easy it is to safely include both files and switch between the namespaces we wish to call.
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