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。
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。
On the other hand, if one author can have multiple books, and one book can also have multiple authors, it's called a many-to-many relation.
另一方面，如果一个作者拥有多本书籍，一本书又有多个作者，就称为多对多关系。
A book can have multiple authors, which means that there's a many-to-many relationship between the dw_books table and the dw_authors table.
一本书可能有多位作者，就是说dw_books和dw_authors表之间存在多对多的关系。
The average number of authors on all retracted papers was three, but some had 10 or more. Faked research papers were significantly more likely to have multiple authors.
这个文献数据库中被删除文章的作者数量平均是三名，不过有些文章有10名甚至更多的作者，统计数据还显示，文章的作者如果是多人的话，那么涉嫌学术造假的可能性便会显著上升。
The authors of the study stress that global warming is real, and that increases in atmospheric CO2, which has doubled from pre-industrial standards, will have multiple serious impacts.
研究人员强调全球气候变暖是事实，它是有大气中的二氧化碳含量增多引起的。自从工业化以后，二氧化碳含量加倍的增长，浙江造成多重严重的不良影响。
Authors can submit multiple sets of design scheme which must be original and have never been published before in any form, and have complete intellectual property rights.
应征作者可同时提交多套设计方案，所提交作品必须为原创，此前未以任何形式发表，并具备完整的知识产权。
Authors can submit multiple sets of design scheme which must be original and have never been published before in any form, and have complete intellectual property rights.
应征作者可同时提交多套设计方案，所提交作品必须为原创，此前未以任何形式发表，并具备完整的知识产权。
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