Hierarchical data has a parent-child relationship that is not naturally represented in a relational database table.分级数据的父子关系不能在关系数据库表中自然的表示出来。
This changing parent-child relationship may make adolescents refuse the parental involvement in DMTs.如果双亲没有考虑少年的感受需要而强行参与青少年之糖尿病健康照护，亲子间的冲突可能产生。