正如你看到的，我只是使例子更加健壮，但是对于实际业务代码影响最小。
As you can see, I just made the example more robust with minimal impact on the actual business code.
您可以通过添加“默认”语言环境使配置更加健壮。
You could make the configuration more robust by adding a "default" locale.
它将从软件工程的角度观察样式表，并展示如何使之更加健壮和安全。
It looks at stylesheets from a software engineering point of view and shows how to make them more robust and secure.
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