Ensure that the text in your document is organised by chapters, and that the chapter titles and, if you want, the section titles, use one of the predefined heading paragraph styles. You must also assign a numbering option to the heading paragraph styles.
确保文档中的文字按章节组织，且章标题和节标题（如果需要）使用一种预设的标题段落样式。同时，还必须为标题段落样式指定编号选项。