第9章涵盖了一些高级主题，如果您要构建实际的应用程序，将会需要它们。

Chapter 9 covers advanced topics that you'll need if you're going to build real applications.

youdao

我们会在《第6章- Scala高级面向对象编程》中详细讨论重写抽象和具体成员。

We'll discuss overriding abstract and concrete members in detail in Chapter 6, Advanced Object-Oriented Programming in Scala.

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我们会在《第6章- Scala高级面向对象编程》中的“Case Class(案例类)”中看到另外一个使用命名参数和默认参数的例子。

We'll see another useful example of named and default arguments when we discuss case classes in the section called "case classes" in Chapter 6, Advanced Object-Oriented Programming in Scala.

youdao

But then, page eight, also in chapter two, he argues that it is possible for a utilitarian to distinguish higher from lower pleasures.

但在第八页，即第二章中，他提出功利主义者可以区分,高级和低级快乐。

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