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many2one 和one2many，一个数据库表字段是不是只可以是一种？（也就是说many2one 或者one2many，不可能同时是两种关系）如果一个表1字段1与表2字段1是many2one ，同时表1字段1与表3字段1是one2many关系的时候，怎么定义？