Bidirectional associations are more complex, and we don't cover them in this article.

双向的多对多关系是非常复杂的，在本文中我们不会涉及。

youdao

Bidirectional associations are more complex, and we don't cover them in this article.

双向的多对多关系是非常复杂的，在本文中我们不会涉及。

youdao