As you move down the tree of nodes, the DN of each parent nodes is included in the DN of its child nodes.
当向下移动节点树时，每个父节点的DN被包含在其子节点的DN中。
It provides pages with hyperlinks that enable you to move up and down the hierarchical tree.
它提供了具有超链接的页面，使您能够在层次结构树中上下移动。
The main building is designed to resemble a tree with 8 floating observatories that move up and down like leaves on their branches.
该建筑主塔外形类似一棵大树，附有8个移动的观景台，能够像树叶一样在“树干”上上下浮动。
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