Author and Title are the only required fields to enter, but one is encouraged to add keywords, genre, even ISBN number if available.

必填项只有标题与作者名，不过鼓励填写关键词、分类、甚至IS BN号(如果有的话)。

youdao

A database view of these search forms is provided that lists the author of the query, the date and time the query was submitted and the keywords used in the query.

对于这些搜索表单，由一个数据库视图列出查询发起者、查询提交的日期和时间以及查询所包括的关键词。

youdao

Set the document title, subject, author, keywords, creator to the encrypted PDF file (s).

设置文档的标题，主题，作者，关键词，造物主对加密的PD F文件(的)。

youdao