... private Long id;// 主键 private String sn;// 目录编号 private String title; // 目录名称 ...
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他们有相同的目录编号。
目录编号和有关资料只是用于表明所采用的材料质量和工艺技术的水平。
Catalog Numbers and references are given only as an indication of the quality of materials and workmanship to be used.
可以用List或Map实现这个关系；但是Map提供的优势是它能提供快速的查询，也就是说用图书目录编号作为键。
You could use a List or a Map to implement the relationship; however, a Map offers the advantage that it can provide fast lookup given, say, the book catalog number as the key.
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