Don't add one here to avoid hierarchical nesting.

不要再添加节点了以避免层次嵌套。

youdao

Also, topics have no internal hierarchical nesting; for internal organization, they rely on sections that define or directly support the topic.

主题也没有内部层次嵌套，而依赖于定义或直接支持主题的section。

youdao