There are four categories of basic structure can be used as water or obstructions on the bridge: rigid frame bridge, cantilever bridge, arch, and suspension system.
这里有4类基本结构可以用作水面上的或障碍物上的桥：刚架桥、悬臂桥、拱桥、和悬索桥体系。
There are four categories of basic structure can be used as water or obstructions on the bridge: rigid frame bridge, cantilever bridge, arch, and suspension system.
这里有4类基本结构可以用作水面上的或障碍物上的桥：刚架桥、悬臂桥、拱桥、和悬索桥体系。
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