At first glance this is just another thread pool, but it supports parent-child relationships between tasks.

乍看之下，它似乎是另外一种线程池，但它却支持任务之间的父子关系。

youdao

The document Object Model represents elements, text, and other types of nodes within an XML document as a series of parent-child relationships.

文档对象模型将XML文档内的元素、文本和其他类型的节点呈现为一系列的父子关系。

youdao

Excessive control is responsible for most problems in couples' relationships, parent/child relationships and the boss/employee dynamic.

大部分夫妻关系问题、亲子关系问题和老板/雇员之间的关系变化都起因于过度控制。

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This in turn has fostered positive parent- child relationships and, in turn, holistic child development.

UNESCO: Family Literacy Programmes (FLPs)

"IGM might change attitudes toward the human person, the nature of human reproduction, and parent-child relationships, " they reported.

BBC: Scientists oppose human gene modification

Another article says that preference should be given to traditional (ie heterosexual) family relationships, and says that marriage and the parent-child relationship form the basis of the traditional family.

BBC: Q&A: Hungary's controversial constitutional changes