The <many-to-many> tag's class attribute specifies the target class for the many-to-many association.

<many-to-many>标签中的class属性用来指明多对多关系中的目标类。

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The <many-to-many> tag's column attribute specifies the foreign key column in the link table that relates the link table to the mapping table for the target class.

<many-to-many>标签中的column属性用来指定连接表与目标类的映射表链接的外键。

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Finally, the many-key attribute indicates to store this Book instance's ISBN in your many-to-many table, as well.

最后，many-key 属性表明要存储这个 Book 实例的 ISBN 到多对多表中。

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But 20 percent of the population or 12 million people smoke in France, and more than 70, 000 reportedly die every year from what doctors attribute to smoking-related illnesses which many French people, at least in my experience, instead attribute to prolonged exposure to American culture.

NPR: A Tradition Ends in French Cafes

Economists attribute the slump to technology, saying it has rendered many mid-skill administrative professions obsolete.

FORBES: Wages Becoming Increasingly Polarized, Economists Confirm