Each also contains elements, which provide URL links to detailed book information, a thumbnail image, a preview (if available), and annotations such as reviews and ratings.
每个还包含一些元素，这些元素提供的URL链接可链接到详细的图书信息、缩略图、预览(如果有)以及评论和评分等注释。
Like other annotations such as bookmarks, breakpoints, and syntax problems, these are indicated by a symbol in the left margin of the editor.
与其他注释(如书签、断点和语法问题)类似，这些注释也是通过编辑器左侧空白上的符号来指示的。
The descriptor can also provide the same metadata information about the entities as annotations, such as primary key field, and any mappings between objects.
描述符也可以提供与注释相同的有关实体的元数据信息，如主键字段，以及对象之间的任何映射。
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