SDO有一个很重要的特点就是使数据操作变得更容易了，因此一旦构造好一个数据图，很重要的一点就是需要使用SDO API来遍历树结构，并访问其中的元素。
An important part of SDO is to make data manipulation easier. So once a data Graph is constructed, it is important to be able to traverse the tree and to access its elements with the SDO API.
介绍了该体系的结构特点、初始预张力确定、动力特性、荷载作用下的力学性能，以及主要节点构造等。
The structural features of the system, determination of initial pre-tension, dynamic functions, mechanical behaviors under load and the construction of main nodes, are introduced.
介绍这种桥梁的设计背景、结构构造和结构特点。
In this paper, design background, structural details and features of the bridge are presented.
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