contents 表“内容，目录”时，谓语动词用复数。如：

Don't worry about your spelling; it's the contents that count. 不必担心你的拼字，重要的是内容。《21世纪英汉汉英双向词典》

The contents of a book are its different chapters and sections. 一本书的目录就是它不同的章节。《柯林斯高阶英汉双解学习词典》

The contents of the document remain secret.文档的内容仍然是机密的。《麦克米兰英语词典》