The nested structure gives a sequence and hierarchy of topics within a topic collection.
嵌套的结构在主题集合中给出一个主题序列和层次结构。
A map can define the navigation hierarchy for a help system or the sequence and nesting of topics in a book.
映射可以定义帮助系统的导航层次结构，或者图书中主题的先后顺序和嵌套。
Sequences support a defined sequence for an object, such as the hierarchy of a person's role within in an organization.
序列用于定义对象的次序，比如机构中人员角色的层次结构。
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