In the latter case, you assemble the documents into nested structures as required, such as when delivering printed or printable information that has a part and chapter hierarchy.
在后一种情形中，根据需要将文档组装成嵌套结构，比如说当交付有部分和章节层次的印刷或可打印的信息。
2
As we discussed in Part 1, classloaders use a tree-structured hierarchy.
正如我们在第1部分中讨论的，classloader使用一个树状层次结构。
3
"Discover Python, Part 2" discusses the Python type hierarchy and provides a discussion of the Python tuple.