For instance, items placed after tables often require relative positioning because the user can often add rows to the table and make it longer.

例如，放置在表下面的那些项目通常需要使用相对定位，原因是用户可能经常会向表中添加行，这样表就会变长。

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He then goes step by step through the process of using CSS positioning to lay out pages that have traditionally been laid out using HTML tables.

接下来通过逐步使用CSS定位的过程编排网页，具有传统使用HTML表格布置。

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