章节编号1，从第1页到23页。
页码和章节编号也可以，但不太容易找。
Page and section numbers are fine, too, but not quite as easy to work with.
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。
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.
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