应该两个都可以,以下是字典节选：
content
noun-see also CONTENT
(contents) [pl.] the things that are contained in sth:（事物内部包含的东西）---内容 He tipped the contents of the bag onto the table.◆ Fire has caused severe damage to the contents of the building.◆ She hadn't read the letter and so was unaware of its contents.
(contents) [pl.] the different sections that are contained in a book:（一本书中包含的不同部分）---目录 a table of contents (= the list at the front of a book) ◆ a contents page