In the code above, we created a new chapter object, chapter1, with the title "This is chapter 1." Setting number depth to 0 will not display the chapter number on page.
在上面的代码中，创建了一个新的章节对象，chapter1，其标题为“This is chapter 1”，将编号级别设为0就不会在页面上显示章节编号。
We'll explore this class in greater detail in Chapter 5, Basic Object-Oriented Programming in Scala.
我们会在《第5章- Scala基础面向对象编程》中来探索这个类的更多细节。
We'll discuss these exceptions in Chapter 5, Basic Object-Oriented Programming in Scala.
我们会在《第5章- Scala基础面向对象编程》中讨论这些例外。
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