通过寻找模型搜索器中的类，找出等级树状结构类，双击打开编辑器中的类，按下f 4以打开等级树。
Discover the hierarchical tree structure classes by finding the class in the Model Explorer, double-click to open the class in the editor, and press F4 to open the hierarchy tree.
滨海湾花园的其中一个特色元素就是超级树，它们是树状结构体，高度在25米到50米之间（9-16层高）。
One of the more impressive elements will be the Supertrees, which are tree-like structures ranging in height from 25 metres and 50 metres in height (9 to 16 stories).
准确路径识别模型是指依据图的支撑树理论，添加标识站，把环形路网结构变为树状结构的模型。
In accordance with the prop tree diagram theory, adding the marking stations, the path-marking model in accurate way changes he annular structure speedway network into the tree structure.
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