This is the case because a book can have multiple authors, as shown in Listing 1.
这是因为一本书可以具有多个作者，如清单1所示。
If books can have multiple authors, where might the database store a second author?
如果书籍有多个作者，那么数据库将第二个作者存储在哪里？
In other words, one book can have multiple authors, and one author can write many books.
换句话说，一本书可以有多位作者，一位作者可以出版多本书。
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